Malicious PDF — malware analysis report

Static analysis result for SHA-256 59cd7e5b6d0d1400…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 15:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 92f23c1e4542e9c24fc94c27ecde0cba SHA-1: b376ed6bb44a0ea896460eab48e415e231650217 SHA-256: 59cd7e5b6d0d1400beaca635ae819b0ac23121911bfb0dd4e1cc6dd896c645b0
176 Risk Score

Malware Insights

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

The PDF employs an image-only lure, a common tactic to trick users into interacting with embedded links. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/fcf9092bc5a95f31dbcf5e32c92c3ac0/kakefelipedupolumabod.pdf In PDF document text
    • https://commonlawhouse.in/userfiles/file/72223825051.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/51438089466.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/sisuk.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/mijiwefusotuwopiduzuvog.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109110525587355.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5bd3cb73eab32269aa2c48be4b1b06ad/sepabevuzadezorulut.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/lujaxasawepor.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/lodut.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/vidozuzidure.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16148048d4a65d---66386043884.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/pejupabi.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/xapigaz.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/38005497063.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec59ef1309---95713831014.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/89cda3a4c9ed137294cb0de0f5e3e594/59424987773.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/xowadajofew.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/64942653581.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/8050561704.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/46414072549.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/gagetorebufisugezegeginu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=animal+crossing+n64+romPDF 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_off0000b0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A9 14420 bytes
SHA-256: a40fcf7b138a4a88de9a8cd6e6f99cc6d3b5b58a8002386f030053fc244a9f84
font_01_sfnt_off0000d4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 10568 bytes
SHA-256: 76cb47c7aa00a406cbf53884a1157dcf9164edde061b705cbaf81a7bc71ef499
font_02_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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