Malicious PDF — malware analysis report

Static analysis result for SHA-256 3193c6d027daaa85…

MALICIOUS

PDF

91.3 KB Created: 2021-06-26 02:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5064a98489490c4c403abe2a6673f0ac SHA-1: a503f9e15fe2497f5e67c4f3ce14231d5646fed1 SHA-256: 3193c6d027daaa85e8544a96cfba079ffaeb3be46c2d28a358d26ffda041ee96
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://laborke.ru/uplcv?utm_term=can+we+download+pdf+in+iphone
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/fb4ad9a700270194bad5eabd82aece8c/84152761629.pdf
    • https://newtech-utm.pl/userfiles/file/gejowufugizutitofi.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/5bde8c9b86ef9e4955221ac447892c4a/69214885548.pdf
    • http://www.bandungmesin.com/file/rexaj.pdf
    • https://itchanoi.vn/uploads/news_file/76905895786.pdf
    • http://savvyais.com/userfiles/file/ximodedetutefupojuput.pdf
    • http://keacg.com/upload/files/bawirafekaledutuvevowoz.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8lj0lqu3gv13sa8tdmtnmu46c7/wolifaza.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3eb255bcd03f6f13858aecfd0f37c707/6658957579.pdf
    • https://ortechindustries.ca/ci/userfiles/files/94072856735.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/99806414742.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/16b1aa6b5b6ddbbf487e7a86f9553cb4/dazifipovunirimuja.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/14aafd2f415c37da7f985354c0141042/bemikajukukuredufafisoto.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738c1e4bc6b---xenunogul.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dnp6g7cebmpq238hrkf8qog9jn/sizizol.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/27c26d6c9d736c7b625ede7b90aaaa8a/nexorodaz.pdf
    • http://studiogallerani.it/userfiles/files/26893475258.pdf
    • http://bhs-class1957.com/clients/35434/File/vidatoz.pdf
    • http://fine-cottage.ru/userfiles/files/pemupukat.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5ba1e8023dad822f167bac0f3aefe6ec/78942741312.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083233f1fbcf---divexodolaweliza.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/pee26n3qm0v6upknctruav58b2/wegosiparivanin.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210605060542.pdf
    • http://akinmedikal.com/uploads/file/banetemiraguvo.pdf
    • 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_off0001034c.bin
44497768b01a647cf2826e6b6714292e19894980aa4c9a27e111e896aeb90f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 17416 bytes
font_01_sfnt_off000130af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130AF 16792 bytes
font_02_sfnt_off000148c6.bin
018fec6f3593372c7863f4a43a9b397af4827f395279b336c6ef07e516d75384
pdf-font-stream PDF embedded font (sfnt) at offset 0x148C6 10348 bytes