Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc52d889eebb798…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 20:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01ad81e3c0132fa27826630ddbc15028 SHA-1: 29c36d844534871b8d2a1dc46435370c188f2fdf SHA-256: abc52d889eebb7984ff3b395862aff7047b33c140c93f0193f657d6d9745d5cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610a44c1e9243---66806292500.pdf In PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210714093306.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/68130064727.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701c69dcb43---78642356191.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d626a4f9f2044235a1af88f0f1f0411/selepusivaluragog.pdfIn PDF document text
    • http://rotang.net/userfiles/file/65315675754.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/risaven.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/joxemofejulupizimewumevi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092594fd3c02---guwoperagiwaxizomenaw.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/10044598131.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6dc8cc55---59678323172.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/mulukodaki.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/vibotokotunobijalejirili.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/998a9865fc4f3057d26cb4c329486f8a/15775121638.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/1uthsl401r8hrjrfmr41npa2lo/65322437908.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/29766481900.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/17048047200.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/nidox.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021043011522325.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1bd14facc379038d49726ec223c8ea49/73424947800.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69a6875ee---46835209619.pdfIn PDF document text
    • http://unionzglobal.com/ckupload/files/1232703900.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e581c0950fe3cfbd1c561a7bb0e201cf/jutirinajipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=agricultura+sustentable+definicion+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_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 17348 bytes
SHA-256: 811788196c25ce94288d4825f5013247ebecb151b87e309722a22ca1e0ffff8f
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 11016 bytes
SHA-256: c5314b81fca1357f2764e5fe44ebf95ef492842b1467a683ef0c26fb2cb5f39b

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