Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2138c2e7ad7593…

MALICIOUS

PDF

134.4 KB Created: 2021-08-16 03:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b67c2cc8e7827486ba29d1aa0c5970fc SHA-1: d5d3c18ad1e2faf1833baa9374dd76c183970106 SHA-256: 9b2138c2e7ad7593841e24db41de9f70a9746e1812dc399d2480b1ce67d29d39
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9619

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fde2d9d08029d8fba922899cba326956/jeruxolix.pdf In PDF document text
    • http://nomorecpapmachine.com/userfiles/files/tipumitapabemujax.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074353a4174f---mamoguposigebare.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/jajozomagorogekexorezo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608340da22092---22939716121.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97b9df67d---1138884736.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/52297701112.pdfIn PDF document text
    • http://thaide.org/userfiles/file/zojidariwifuzinoloton.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb43c8fb33---gomaf.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/bumositoguwi.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8b13a3999---wunanorutuwevajurado.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/pajulonidopugutifazikizad.pdfIn PDF document text
    • http://grandparkoptimum.com/ckfinder/userfiles/files/vobinujawaxekimapezen.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160849b6d48c06---54507713216.pdfIn PDF document text
    • https://ultralloy.net/upload/files/bibafipoduwajopokur.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/12128411450.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/majemipebobulazemubirewe.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/69935536784.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0606ed005---xunitunezafuparoxofo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8hfm1p4ffuel7vcj2rplp8dv9e/10359982920.pdfIn PDF document text
    • http://naucseto.cz/storage/jimuniladetezosenagoju.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f265890a6---wewoximetedijuxuja.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/57309212446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=angry+birds+transformers+jenga+code+ios+14PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18837 11268 bytes
SHA-256: 2165071e4dcad7e3f8eea99b5c53fb089c9185f4ed098c0caded3be7c78849aa
font_01_sfnt_off0001a28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A28E 1720 bytes
SHA-256: 9c3c50ca7885eb1b87261f6f74ba185aca171ae216209544253fbc3ee3acc073
font_02_sfnt_off0001aab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001c2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2C6 27848 bytes
SHA-256: 46234d27c3d714bb1c87d5858f7905ea9dfe07ce5b78719e6a23e325921013d4

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