Malicious PDF — malware analysis report

Static analysis result for SHA-256 d351fd9c2e2adda6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 04:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4dfd27b4d6bc38a888a4f1979806dfa SHA-1: b9c4df8d5233252813cce108dc28d8dcdd5784c2 SHA-256: d351fd9c2e2adda64ba9c72fb94cec394359c6764705cdd918df39b0afe43968
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f52af9d7da1b0100c57f96b0236e25d7/suluposujosudolafinive.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f7334c624d9fdbe139de48ac89133912/43201113041.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5ec1b850c86d7beeb723f2355e987226/zipedisaxarimonoveve.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/nirefagopuxux.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074b0b7b93f6---95832374916.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3424e05ea2---safutamubufonoxopi.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/4849035448.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/90651246272.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/lisapefamarewol.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/50383571350.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/15354334236.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/44998365277.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/94833040235.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/36a39d8ef4844f96d33b8f4c4d98619a/62844267902.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/35793581855.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021072809131670554.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/38440692121.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c30c67347---vigirap.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9effac9828---novonojokemudigepago.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/rugulitepaduwag.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/buginarevakinojetax.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89736005494.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/20175967319.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e06305fb668092bc77e385730b33bfa4/74368689444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=maternal+uncle+meaningPDF 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_off0000d01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 21004 bytes
SHA-256: 7d841af09df4f0f5185da09956b23f458ad141b7f83c66a30054a473a1228332
font_02_sfnt_off00011ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 10380 bytes
SHA-256: cb4f6fda0ea521e9ff7da6eaf87a0603fa9003c3ce39c80d0d28cec26f6e03db

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