Malicious PDF — malware analysis report

Static analysis result for SHA-256 f934eaf967430b6e…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 11:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0a0b7c57fa7760740461135ca5bdfe4 SHA-1: 0e004b9d6c1d79493dae1d2484a765c3d744ba65 SHA-256: f934eaf967430b6e09d8a25b342f5f061679c0bfacacfc49a07026b2c92fe35a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7049

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
  • 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://objets.immoweiss.lu/userfiles/files/59168807094.pdf In PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/59344251362.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/13519406489.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///terebuvorepapulageviboja.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/92217345734.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/siwogobire.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/98626342863.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/kogepinupixejone.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404f17d1a10---5727551272.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/luriwomikolitogalefo.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/33736714602.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16322968927511.pdfIn PDF document text
    • http://lovesenergy.com/file/37925255283.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b54df08774e2affcec2e8b6aa8b2e89c/81293918941.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/51864837206.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210905031130955.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/viwetinopudesumaxo.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/58593839558.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/kulizot.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/fososesefida.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/67702853811.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1890cd9c0---19083823937.pdfIn PDF document text
    • http://ladna.pl/user_images/file/16316926911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mcc+apn+settingsPDF link annotation
    • 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_off0000b60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60E 10276 bytes
SHA-256: 4ef32403f3c5bca749cfb13dfeac5c4ed68d8df32e855d92580bc19d23f18e23
font_01_sfnt_off0000cd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5A 19504 bytes
SHA-256: ffc9d84e48d45626d52aaec0a3e12876b84a98f7ae1ae0353579770196777ded
font_02_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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