Malicious PDF — malware analysis report

Static analysis result for SHA-256 e386522307d1058d…

MALICIOUS

PDF

82.4 KB Created: 2021-08-23 16:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6a2c1de75b3acde4103e43c3ee908c6 SHA-1: f212ecac7b8e0a897fe78aea5814c689ccd0cc23 SHA-256: e386522307d1058d221b4e1b4737114d7807a3b338a6500e17339ce752b64660
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be junk data, further indicating a malicious intent rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=how+is+a+recessive+allele+different+from+a+dominant+allele PDF link annotation
    • https://eurouniversal.eu/ckfinder/userfiles/files/41177483375.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/78c9ab93db8c7d892ee021852447a877/67659412728.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/q5dkg1ssrugbvmc1fl1dkn8c12/57677420988.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/xitikul.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/jafasigefitezomov.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/dajawuzujomolepadizifim.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/5c150b664fa219016fe9d038697b12da/jerijololanen.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160748e118bd14---tinanitafimibosafoneranoj.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/robinifiwutidakukilojika.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210814_4FDF90BB3136E5BB.pdfIn PDF document text
    • http://nut-shell.net/upload/files/91981845616.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8820824a---31909022239.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/kuruzenexemaso.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/21c1cb10f79e55d3520597829469648c/semazibipulabukitozes.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c978773678c---4347472163.pdfIn PDF document text
    • https://emmaushuis.org/pages/57662410515.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/18086095533.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/286e3f70394c88b4431ddb84ea11699e/50565327920.pdfIn PDF document text
    • http://heizler.hu/files/file/tanix.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/39256505238.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/zasodawurisipezubaju.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b84b29cc3df74d82fb7c9b56dc4a2f64/89605412234.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/lunenu.pdfIn 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_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 16464 bytes
SHA-256: 3c0ab8e23bb0f0549fcd98ca3913018fdfe4e545b5c751217fa07dbe66d94c8f
font_02_sfnt_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 10780 bytes
SHA-256: b6ca503e1e9b23e18256788fd7ac1a8814f6705fd2bdda5015d278773349ec20

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