Malicious PDF — malware analysis report

Static analysis result for SHA-256 29bc26a5bb0eb899…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 19:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c52ecb52cc683e2cfec46bdca78af69 SHA-1: adff0d7f3eb6c1bdb0eb49c1f1ff05b7a2eb33a0 SHA-256: 29bc26a5bb0eb899672ba263fb7aba505bb170b1be47f120b4e9f1f0586ed013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to phish or redirect users. The presence of external URI heuristics and link farm indicators strongly supports a phishing or redirection attack pattern. No scripts were extracted, but the overall structure and URL analysis indicate a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/85634905183.pdf In PDF document text
    • https://dijitalsanat.link/upload/files/93809184085.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ab0afdf34cb7e21f8bfbcad6786844f6/55966110476.pdfIn PDF document text
    • http://pottoka.info/files/galeria/files/worenilofipibufefusa.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2940d3955---63710031564.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/16951942161.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93825588341.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/21979663915.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/82152619295.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134cec23c5dd---futujudabo.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/jerugeduxabimuwavilos.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/sidivivodetubo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/fapibafu.pdfIn PDF document text
    • http://zerosquareonline.com/file/xezunisazepemab.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/5524605360.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/50902167939.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613097b0981e2---buvivavufa.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/fopetunidegoturiso.pdfIn PDF document text
    • http://iucecb.com/files/file/mujegiketemuvuluxa.pdfIn PDF document text
    • https://andana.us/files/files/43920801883.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/86958397980.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/99369371755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+odk+collect+appPDF 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_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 17952 bytes
SHA-256: da9d78643549da34ead03c79cee42622b9d84fb99e18cdf10e36a8f3793e8127
font_01_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 10328 bytes
SHA-256: ab2f018ce17204b13a2dfa0afa7ad9e6248219b314f938a64317ff6153315fec
font_02_sfnt_off00013144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1