Malicious PDF — malware analysis report

Static analysis result for SHA-256 7864b2bea1a8e015…

MALICIOUS

PDF

95.3 KB Created: 2021-08-05 06:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ec1a2416987179e7232d9e61a0347e33 SHA-1: ad8b1593ff272c16d03dc51f56514d7d8a1bd47b SHA-256: 7864b2bea1a8e0151ea452901bf1d45cdabdf96a8d1897dd6770adead3f9e3b8
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the document attempts to bypass security software and instructs the user to disable it, a common tactic for malware delivery. It also mentions password-protected archives, suggesting a multi-stage infection process where the user is prompted to open an encrypted file. No scripts were extracted, but the document's structure and heuristics point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://braintreeclinics.com/app/webroot/img/files/57417731538.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d055b4ce4---ninukaxolosogulef.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160702c9bba106---jugefi.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/72134996114.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b2ebd3d8ea7655112b138ea748c4feec/96534141628.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/926428687.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/63133044940.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb2f848dd---93647547733.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becc285fb4e---sugadasi.pdfIn PDF document text
    • http://allasclub.com/campannas/file/monaxewitorekozeg.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609289d5db549---88719869255.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161078c7e37b64---42143534318.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/cda8763cbc55a9ded3ba1e86b0900be3/zewitisaganas.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/jozagamodenaxixat.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/koxejobufurovuj.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/sigobudezelufawatizame.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e68a456d66---94874944948.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/ditalawesi.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/57246339825.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4p8q5uao6h2pa54qqc3j9h6lna/83715820519.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21b461d19---jebuxipi.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/42751456313.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/15ed33fd06ca3a532cda148f653afa25/24391188274.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5341eda353---16177775079.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/00ef213f7fa01b4c8fa2bf79a28adbe1/tanibuboduzeluxunebeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=activator+chew+wga+0.9PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00011109.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11109 23304 bytes
SHA-256: 13bf2c981401dc9e942a4749f7612100f3dba1a2297587cfc22b12ed15c5b61a
font_00_sfnt_off0000dac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 21152 bytes
SHA-256: 8fdf1cd89e7374b2798ea0e0f88f18bd2f6f1f7d5341da46db82664a9b32de0f
font_02_sfnt_off00013b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B63 10680 bytes
SHA-256: 1b7dd25afce606cff23701c9eb762586dbd69c44ce6555064884573d19796a03
font_03_sfnt_off00015430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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