Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d80d0f394ac8256…

MALICIOUS

PDF

109.5 KB Created: 2021-09-03 04:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7996f9c1ee0d69e6e83a5f48b5b45c1d SHA-1: 03311f5d76087225a205bded5b6bb719b32ccefc SHA-256: 8d80d0f394ac8256dc6d7540954222dc7de506c6009913ca53260e0dac029ae9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859cd521bcb---65478480547.pdf In PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/38311840233.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/c88e32d507c53973e4ed481a1caed9de/63134577605.pdfIn PDF document text
    • http://afro-safari.com/upload/files/81267719432.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/71480127555.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/6364316242.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8c0ddcc1a---guxipenajuralegomezokalav.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/zaruzigajuzagujexi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kskjrp90dnhckm281u7dl4tt65/rufaxozinun.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818d8ea7661---74766703878.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/felomexagusidepuluwazor.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611b816cc0ca2---gazepawufisisime.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/19030108716.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/qt22k0laoogsasr37lo7f246pn/27973375619.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/60212497996.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/falofewevetezesin.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/xurupakusemiledawodebad.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611751f0bbb5a---16504504095.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/gejibate.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/86236812190.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cd9cf5e170---41046752233.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/65971749161.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/nemizimibigubosujuxoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=schelling+philosophy+of+revelation+pdfPDF 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_off00013ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF9 20980 bytes
SHA-256: a85ecdfc568b2f4cf4a37edea971d190e0ae7f3d6b5d1f638c51b8917a966de7
font_01_sfnt_off000175fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FC 11156 bytes
SHA-256: ec8ef3b9f29b46613c61c0a029eda1ffb57a704f3c110b640d7a25f24ee8c919
font_02_sfnt_off00018fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1