Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eae326b66c5cb21…

MALICIOUS

PDF

83.8 KB Created: 2021-07-01 00:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92a49d54fff22c4f516c0eb5228082fc SHA-1: 72338229bf1dff1d56b417a5b361ed7a8f6387ff SHA-256: 4eae326b66c5cb21af1e8a8299d52221d6ca39e7a6922272c921ac1644ca61a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the nature of the link farm and the detection name imply a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://catamma.ru/uplcv?utm_term=polite+request+examples
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c14d2e76007---fiwubojezewa.pdf
    • http://graphicyazd.com/ckfinder/userfiles/files/tazupikunelezirukab.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d5dc69e6e---lumirimagubafef.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a73df99727903ae6f6eadd216b83ea55/zofibetaj.pdf
    • http://chinasoftcore.com/userfiles/file///99333386930.pdf
    • http://bannermaul.com/userData/board/file/zuwivinewajonaxinas.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9d10d6e20---zuzokagekojaxaretonidilo.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd799878d9---44266241313.pdf
    • http://bestbuyfromindia.com/userfiles/file/15728204508.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607315ed79739---3701540068.pdf
    • http://clairerolo.com/userfiles/file/3466278150.pdf
    • http://interreg-ipa-husrb.com/downloads/wugemaxon.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092dabf0f858---dipediwisovenad.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d0cc2604---pawumuzipapakafa.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ibfohqot7l3n9vdaqp2sgudcs1/82141485534.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac28a88c7b2---46295623382.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaf9202803---85062023816.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d01c974b856---13486046676.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b32570e530bd8ed33f46791d1fa317a9/wunok.pdf
    • http://www.findvoters.com/userfiles/file/gurebafareku.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88e96b7e1---nodopudegejelewada.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e36b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE36B 16792 bytes
font_01_sfnt_off0000fb7d.bin
bec1359b23c08a70d8e081375d0d84de282aebec087dfeb4fba9bdbf0fb8764b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 17232 bytes
font_02_sfnt_off00012840.bin
76ccd04298e911f1f8bdd0320247fe7e51a4efc9c1e642eb4106ab609c7ea368
pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 10660 bytes