Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c880c8a065ec73…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 17:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d529a7d5dfd8bc72468dd7c1b3c4fcab SHA-1: 4fef9c00de2fbe68979232a1cd1277dc44752a6b SHA-256: d8c880c8a065ec739a236887b5cfa3752fb73a0065ecc1685dad6db9a454dc38
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312f1912137---10049151825.pdf In PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/o2kcfm2c07v4ehmpq2nqo3ama1/53278764987.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/eljj8gr9o47vgo5jf15182sbpd/kobezasesusewowafojufapu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c8d952a01---72608531663.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/67002845293.pdfIn PDF document text
    • https://pecintajp.com/contents/files/nanerinegarumusugew.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/togogafedid.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/rikadeletudeb.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jojebokozurosobavo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bp8pg2qic3cedhi24vsoj9v39d/19957204071.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/61508240912.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/55264948395.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/xanigerotegigali.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/29786445846.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/gusigaresolaluvubonuzamo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613746b3d316d---ninesusodojupajujoz.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/79839716399.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/27370670445.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5c37bf97ec33db1c73ad8bd5d1ba7c3/20214335237.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/36084219981.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/50564168586.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/mizot.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/55563688365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=carx+racing+2PDF 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_off0000af7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7A 14580 bytes
SHA-256: 6eea6779124899607aa751da74a141c29b1768fc54d6f462ebf486cf4bf1cf1e
font_01_sfnt_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 10092 bytes
SHA-256: a492232edf0ea92a750765d7415a462cd4995724da23315e8738127b034064b8
font_02_sfnt_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1