Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f023dbe2115629f…

MALICIOUS

PDF

115.5 KB Created: 2021-09-06 09:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e4749f304ccb8b648036974f98d2a6f SHA-1: c54a64f931c2b8ed0e60a95f0fe98953d9771085 SHA-256: 9f023dbe2115629fa59d59ffeb3cf12da9914b22b16e89c33269fde5085a181e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites, many of which are associated with the `utm_term` parameter, suggesting a phishing or spam campaign. The presence of urgency lures in the document body further supports a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=parameter+estimation+for+text+analysis+pdf PDF link annotation
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4e389d0d7142bf5c0d34c2d68c5f420c/dazinavevaxikixoxob.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/84063891262.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8a9c2b9bd---xovaxarovuj.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611b641b54987---xanunofagepuxepirazuditem.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da29db72d40---nekaxovirowadi.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610074ac6a9a3---lagomabegezomeseveb.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/femeti.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/28226704716.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/xonopegavomikupawara.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bcb9c6721---93571236617.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/94395493954.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a483f15154---zonibikasilitirekuravus.pdfIn PDF document text
    • http://soles2walk.com/data/file/batile.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/nijuz.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/lajoresiwusog.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de066cd8887---1566067238.pdfIn PDF document text
    • http://centronegozi.com/public/duset.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-7/20210707212009488331.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/fatobobesobig.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/nogikupar.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/rixuzejofali.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_off00015db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB3 18848 bytes
SHA-256: c73c5ad1e93e9e3c57447add149924280188c5907d75ea97860ed161410cdff9
font_01_sfnt_off00018ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EE0 10876 bytes
SHA-256: 98d3efa38efe91c76d33674465b8b6a5320b35652ed90580a1ed0c4f0744d0f3
font_02_sfnt_off0001a80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A80C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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