Malicious PDF — malware analysis report

Static analysis result for SHA-256 289e5aab328aeccd…

MALICIOUS

PDF

87.8 KB Created: 2021-09-05 15:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d1e64ca8dda0dfbcacac594e554561f9 SHA-1: 1ca26c55e621fdaa904fbd043555747f06ca69b0 SHA-256: 289e5aab328aeccd97b914f50b5d9124e0e64ad17d172af5bf1232651f1308a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to improve search engine ranking for malicious links or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=excel+vlookup+practice+worksheets PDF link annotation
    • http://evevoyance.fr/adh/.-/file/domikilazabozanixaleguv.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d20c9261988---pizinikijurenigeliviz.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/wodijojufokez.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9bc1b7bd2c5a2ede3aeee60bb6505b9d/86866000236.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c682e44f16b---pavureridalubiw.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36c3165c3d---jifotugobojujitoz.pdfIn PDF document text
    • http://888chji.com/userfiles/files/najotizozisovesexijedalor.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/uauuj9318ivkvi46hvguugku70/38147678310.pdfIn PDF document text
    • http://qdjshg.com/files/file/67216517796.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f3c32619---97557968089.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16077528ebb814---ginimuwananalapozuvilug.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/letasaxototet.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087efe3d26c1---duwudanirexosojukat.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/letalapulisemakivuxixapi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1f0aca979---28352712005.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/golasu.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/2583587947.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/91563985281.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8587174a7fe391926eba8c0d59dce9a9/wivovemibidubaku.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/36235391279.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/84134648741.pdfIn PDF document text
    • http://boxethai38.com/upload/file/xemut.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/18856779148.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/jejokusojusuliwites.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c830eb4f3f---549787113.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/20b2cb18dc2ac30a88b7ecae74d498e3/22899994713.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_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 10796 bytes
SHA-256: e4a0b077069e2c1bf96c3995bd6108a42dfdfcd0a3b58c8749d259f2f3704fd9
font_01_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 18588 bytes
SHA-256: 275ddea8359c6cec85237cd88185e6e7c6c6c1391a24613f46bb2dbf8b8bc6d9
font_02_sfnt_off000139b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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