Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0788fd6ca6a947c…

MALICIOUS

PDF

75.0 KB Created: 2021-06-18 16:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0828a15a4cd8fc88c8a748bd86292fcd SHA-1: 985a3cc9442626c3b60896619c974d5e5de50b90 SHA-256: c0788fd6ca6a947c4cea4919d0e088f9e87dd2089c2f0fa94a39bbdcfe9cc55c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9640

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae9205f37---laxivarulugoma.pdf In PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c13c2aac72---tunibumegaxisafuveged.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/01ppr1kim0kdfch7bg3t0lktl3/34320091604.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3114b10aee29cc3ec956b8935385f991/muzizowazeniriduka.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/wowusolosupe.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202106181359447929.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7893e0feb3b30e96c90990a37953afed/5085692315.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/akiku57pd4nohsvhhr00c4ho56/66408151881.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609474ccc2476---jedoxemomovunawudixaku.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/r4405c0tng7dl7mlkfa7c46lmh/xirilipitipe.pdfIn PDF document text
    • http://blueyee.com/upload/file/111349355553.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/pabifojedavedasozabokiz.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/melokagimolobefa.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/388670a6209d63bcbd5122dd254465a9/34248809823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=employee+kpi+template+xlsPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 5060 bytes
SHA-256: 6264144b62840c47b790996c678b15b8a18cb3ea6e3ac25d770631c63964a9f2
font_01_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 10644 bytes
SHA-256: a38a56b7c7fe81ed1501e111e3e25c8f7d56ae624adb321403a2d03d940837ab

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