Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b58d0ca4d3f706a…

MALICIOUS

PDF

72.4 KB Created: 2021-06-26 23:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6d09ce99b4a4649d0db66261bc5f178 SHA-1: 2db1a9a2a88b09f1bfcab541fa7427f6077cc86c SHA-256: 6b58d0ca4d3f706a495b585e1e2a2c6bd1f98970d79fa3747271a26b7afd7819
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites, likely to download further payloads. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users via a phishing lure, consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/88bd7df47956bd52f473e1ade7b0efb1/dagew.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085846f631e6---65168151341.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/fvle27npj7vsmkn4mp5bl4c0j6/70185845877.pdf
    • http://ontsgoi.shop/uploads/files/vonazososap.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b22d79f9---vevukigobaxozenolele.pdf
    • http://aostavet.it/userfiles/files/netikarukinobiluxof.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85540180a5---36587645527.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/b7uis9bnhnre64p7qa0nv8jjrt/30588153372.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcab27b560---61451826955.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/dl9mo63obav6steriai4p460p3/wagibubanagiwodovasiri.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/96m299uii7hrd9gvsv1od4fut6/86459289817.pdf
    • http://lucann.com/Upload/file/5367358777.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/656002b126ae6c9ddd763820545ab8ca/tejobogega.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vree4dgohsmaivmev52pj913cl/wuxonufugotakofedonil.pdf
    • http://files.ibiza-ferien.de/file/34389789615.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec1c594a7---14300231115.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6620a1978fae1308bdbff446d7409f18/xasijoximirefanakatawa.pdf
    • http://stylowa-pss.pl/userfiles/file/52325866585.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/cfbe82cfb3886b01a6107b8bf6136cd1/36811199531.pdf
    • https://mmszke.hu/files/file/tamini.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091dcf096570---mikeponire.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf98493280---92895491726.pdf
    • http://seamcc.com/UserFiles/files/39641635153.pdf
    • http://firanywiktoria.pl/uploads/editor/file/pilixuzedukewiniperetili.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=types+of+bank+cards
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD1 16792 bytes
font_01_sfnt_off0000d3e8.bin
04c3f030925488e9090b4221a7c0208e4a93040b13d3e21d942c2f1d4c291a31
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 10688 bytes
font_02_sfnt_off0000ec5f.bin
d2c6a0efbc73fcc1d09bf93521b4274cfd6d03515e6c22e4fcac746a86fefc56
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 15132 bytes