Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab22561bf61dca79…

MALICIOUS

PDF

87.9 KB Created: 2021-09-08 11:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82b820ab7f61dc96bf9b514e159066ad SHA-1: 9a9108363f82b2c6547c581a6d7a72ae1a3fe14c SHA-256: ab22561bf61dca793d493017cd78d11d54a972673d622d630dcf29d52a4fc428
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://accessprecision.com/userfiles/file/16130744575.pdf In PDF document text
    • http://guojingmall.com/userfiles/file///26436070520.pdfIn PDF document text
    • https://isosklo.cz/uploads/54651416159.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///bazarajagok.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/a8ef453be6666ad7abbffe3fb1d2ae9f/46692915843.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ea9ec82b5755b8d2ae40d7e9881cd8b2/nukafiremogexo.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/wawilarebujuvuwapiwumaw.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/20726385424.pdfIn PDF document text
    • https://sbufficio.it/file/dezasupip.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/24bb2e9988a09ec4e4d6465f930bdd0d/mimaxuvi.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/88711759283.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/15203030388.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13489a5f58---fixoxagizopoz.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9edabacea8a8442b821132b4b107029f/gemadumimawuvimizali.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/tewisowiwuderutuxenugif.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/40372773203.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/29052957500.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/8910421954.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/1e3f23f19f2c0828b01d4cad5ac0d8c4/46382859453.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd1c4e74f---jimatimoraxulatag.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e1402cbf34fa5a9ba048392f32b300df/88938012408.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5766732a---46603010087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=arthur+ransome+swallows+and+amazons+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_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 10896 bytes
SHA-256: 2a35fe2cee095b8d9799395437fe6e7bdcbfb2a833294d28f19f946c2c207d14
font_02_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 18244 bytes
SHA-256: ee7ae769523c91f35172b046e8880f3b99710ef66f8b11e698ad210b66d30ccd

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