Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8d06e53266cd75…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 23:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3bb287006f0ffa3993d1f6b9d7a7b5aa SHA-1: 7efbaa91a9eab6dc37188d61d8a043f123994547 SHA-256: af8d06e53266cd75577b9d56ddd2e634aa098a487d6f9c6f05198b1b823c9069
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links to potentially compromised domains and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bctlorraine.org/userfiles/file/8857256766.pdf In PDF document text
    • http://sun-tes.ru/files/file/botixipirifiwipaf.pdfIn PDF document text
    • https://coevent.ru/upload/files/negusekerekaloxafugez.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/ebaa475cf0dcd6916b958befda767835/10735176400.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/61225368972.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/tijefolok.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/zumigisorig.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16146e192c832b---7886214662.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/15043762633.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/79357666551.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161312d05c53d2---69775339592.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/72459984564.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/42299652466.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/76795218192.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/sefufutuz.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/77144680639.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/bamozidox.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/73349421942.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/peromujuwunulakijogowilak.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/momepukidipi.pdfIn PDF document text
    • http://asqcert.net/files/files/75583427742.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/31341379895.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210903_180947.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/xewomeguritedalurozerike.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/32929814076.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143dc7acaf52---gazotavozoti.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/muvomoditamoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=video+files+supported+by+androidPDF link annotation
    • http://bit.ly/1In PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 17740 bytes
SHA-256: 0776087006953c8d48d10975d5afe3639388f8dab83b6623e5c77952e4fb4818
font_02_sfnt_off000113a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 10816 bytes
SHA-256: 12bd71702e53c6fdd542bff2fb84279fa774f66a8155587fc909b0e3382fe344

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