Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0815980ebce33d…

MALICIOUS

PDF

83.0 KB Created: 2021-08-25 09:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09688e6dbc92e2c11c2ea968c8815298 SHA-1: c43cef0b02187e6298585182a297ab8b6dbb22ce SHA-256: 7c0815980ebce33dfd24f42ac77292a328f221ba107aa937b5cb8d61f84b4c3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document attempting to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=architect+of+covent+garden PDF link annotation
    • https://hpsoft.shop/upload/files/zapiriduvorupin.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16107bf35db9fa---10896623998.pdfIn PDF document text
    • http://feast.to/upd_file/wodalapasumekefu.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2606562cf1e75c59ae4baf3451d6a2a4/75697910948.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb106d7506---renidafuperegadudogusivi.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vopvgi2ua55lpndtvlgfl6esno/dexalubazuzomu.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/jopeduwer.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f694009d3bb30aef064db2e11caf8211/zekasonobetinovexujugum.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5ea3f1362023233295a2bdb3b79d683d/62119826042.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/61528449342.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd89c97c1b7---37119128596.pdfIn PDF document text
    • http://geotersrl.it/file/vibugapozivojizero.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/17881043955.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cdb52dc18db6910fb133d8a343ab2fd2/jefakezop.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/94121604241.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/c27c5ce746d9f1104178a9c4ffa5ad05/vekuzujek.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/nenapulanu.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/8973111416.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/719d659c8548a165a988e92149127846/dokaris.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa7e3313f---dikonu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e6743fe8d15---89834626788.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58909963004.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/31154655934.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/99572003642.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3469a98e98cd9a5b40e7211b507e8b67/sabiniwaz.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/rifuselutaxukevote.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_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 10588 bytes
SHA-256: 1981198c3c523a288bb7f0722ec63e4c2ee3e672ad6b800b47125d2b9437e2bf
font_02_sfnt_off00010fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 17700 bytes
SHA-256: 1bf487acf013aee721b451f7b38e67f234c96994b3065f85b92393c7bbe31d89

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