Malicious PDF — malware analysis report

Static analysis result for SHA-256 85aaed664089c94d…

MALICIOUS

PDF

119.0 KB Created: 2021-07-28 04:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 12fe8d55bb4d243350e7c45be9039327 SHA-1: eac7d23c76ad7190555856a14978940f3b6ebbd1 SHA-256: 85aaed664089c94d41dae9db7ff10bfc73ee143b94fd5de8bb51e360bddb9005
184 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. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage or disposable hosting, suggesting it's used for phishing or malware distribution. The presence of embedded URLs and the 'link farm' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://10glazsikeyrosa.ru/file/zepopevo.pdf In PDF document text
    • http://feriaalainversa.com/uploaded/files/wasedurevedarusoralu.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/zopupiwusigegiwizadozu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/towigugag.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/46026233897.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b81f32ac46e---12667868407.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/21191444756.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b788505cbd2---derexolivimefop.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098d10a4c17d---93268236703.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/tavabe.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/37019993602.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/66015201413.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/bakewadejuki.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/83121101704.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160795cb3e3388---boropejefawijomez.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be40342e55d---88988187379.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/levixofux.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdce1951fb8---wefijojaselobubav.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/vujomivepulasapunezogu.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/54262832091.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607287d257970---92994352789.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b017c7def5d---gobufusirafanupog.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/74080341586.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/mijozewerabobad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hours+of+work+averaging+agreement+template+albertaPDF link annotation
    • 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_off00016cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000184eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184EB 11176 bytes
SHA-256: 03998ac0b91519daa24e61d4a4f2d39278f0233a698aa33168f2ade998b386a1
font_02_sfnt_off00019edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EDF 17664 bytes
SHA-256: d1e42fb779b1a0c71b6eb63cefd253caf6171ed22b2a929e55f49c5388633bff