Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8635c72ffe4406…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 01:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea0f01cdf57000646c5c24e269c2050a SHA-1: 87a1a836761f4493cd391555ffb1d08f4789f68a SHA-256: 2d8635c72ffe440620c530995160e2fe5313a9f7984a65663475fd8e86db9c2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URI heuristics further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://pwr-tech.ru/userfiles/file/modakoviwuvedepuxof.pdf In PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee862fb2ddf---zunebezowofetiberajo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608163f432632---62789052376.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/76288724520.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/sumakunesalo.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/38729580347.pdfIn PDF document text
    • http://fructusartis.com/i/File/29269918998.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///mudijotogubuzurivam.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/60681397827.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a948ad4be46---dofolinam.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/jotinifigevero.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kobowulixizijapeji.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/vupoluluxisudepo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bebf271f1---polarejuk.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/97331863447.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/traudle4uh0a1ic57t0ge31f00/maxegotafavi.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/1c2af194cb187064f4d95f59832b7353/14244530507.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/11484210138.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/46808698101.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/40374064606.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/pipetuxozatipovebepe.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4cf1274d8c311d611fa30497c430608b/58712459858.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/kl6lmdpkaebvces69tcevftvf0/nojikimonepuxawonewinofuw.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/11145262833.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/wozodurakafikavijiporimed.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/25434367178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=peter+grill+openingPDF 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_off0000d17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 10100 bytes
SHA-256: a013f8eb5b18ca51f9c3d3bd90247a79a43e395508c8ffe0f63d3ed545d43fa1
font_01_sfnt_off0000e80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 20412 bytes
SHA-256: 9db92346be210a21d5cca41391a1e38788284f9c7146577896a4e9f0387ea069

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