Malicious PDF — malware analysis report

Static analysis result for SHA-256 265bddd81c532136…

MALICIOUS

PDF

77.8 KB Created: 2021-06-25 16:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 363fb350bfc3e18a7dba9bf9cd8356e9 SHA-1: a06a0db48f21f2774218e318cdb0c1b4771d60ab SHA-256: 265bddd81c53213633b87e3406e042a5171c8ed895e111833d53d538a5a131f1
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of many external links suggests a phishing or redirection attempt to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b02e3ff3---35146900787.pdf
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/fuvixomer.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fffcdd2e1e---40839649587.pdf
    • http://www.hangmandigital.com/files/file/13524722795.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a41b0775f---gozumijolamiboxodotosamu.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad133b2d42b---84876738974.pdf
    • http://michellesmithscott.com/clients/36670/File/12683961626.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7d7ad1ad---33947632859.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7efa2ef55---27402968032.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/3po0i8lu4ovrpdd84v8f0i39p4/vajin.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/915a1e9b3a290cd87ac38546ac2cba0c/pimofedupu.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7edade88ac---48898394356.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/kncohel6trk3m600154rukmlfi/xizibebafojelejasakojo.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vc6a6dtf3m7924on11av07k8sm/40799646020.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e9cb965e0e7265ebeeda33e56db608e3/tozupelipudokojeji.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b28c471c52a1395b2825a7950cbc2ad2/koxaparefanovasom.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/efdb3f4febd53ad4b7d86768ac4cfbb2/26857456114.pdf
    • https://led7.ru/file/85920281266.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210608155507.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=abscess+with+no+pain
    • 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_off0000d0df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DF 16792 bytes
font_01_sfnt_off0000e8f1.bin
a2ce7b37613c6fa885f80433108a0ee0aee4162628b54a2c89532a4f2e83e2a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 16312 bytes
font_02_sfnt_off00011293.bin
e5ec7612cbe97b4f7dddaaa3b185e61e2f7572abcc5be1890fa9b1754f951230
pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 10532 bytes