Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1766e0dbcad8d9…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 01:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 08016b43161f3b7e0541a72b5fbe3061 SHA-1: 952f46666a0590570b34a2ddfb4f55c8866f15d3 SHA-256: 4f1766e0dbcad8d92209025086f10cbe9eaca197ded1a4aa8db6e2a5a8525330
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://diphong.com/uploads/gugexiberazufetowudezexu.pdf In PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/jobaxosuzo.pdfIn PDF document text
    • http://teknis.it/userfiles/files/bipetubomafej.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/mikonotonanabinegoma.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e074399c16ef6a80ed9dffb799b2bf91/zeruluxatiw.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748d2c026d7---82092324112.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae38bbb7a6---givanujitevagosefifo.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/43200916210.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont//file/53782258384.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/50076585920.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/17552165981.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/051911177468.pdfIn PDF document text
    • http://mariancozma.com/_user/file/zitaduxirika.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/88909465228.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5f2159872---xikobowazapazejupakuxe.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/31643643799.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/fih3vc1gk5l6u2kb5bgcl757c3/29100848726.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/09e3bf839db1059e2b0898ec8129c0f3/69988968969.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/84008527809.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f3ea2f94d7b250d8796e2b621c1d3f4c/22952644119.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/77217846399.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/71670545813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=array+c%2B%2B+programs+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_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 17112 bytes
SHA-256: 763a297653ca88dd7ed5b438d99081991f3cf6d22441daa016a60a70d09448ac
font_02_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 10588 bytes
SHA-256: 23e36f4a8dabec5389b1d50b2f733f6ec82d4a53cc2305aa08ed6d4effe9aeff

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