Malicious PDF — malware analysis report

Static analysis result for SHA-256 3532bb4ef4b66052…

MALICIOUS

PDF

125.7 KB Created: 2021-07-29 18:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d16917a149c8acb5249f83a02c242ee1 SHA-1: d3c1dbd3e2721b25625637c5897113937b7d074b SHA-256: 3532bb4ef4b66052a0d9484b3d9dae3dcf58b278f57542a04995b0d0f235ad2e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://coretry.ru/uplcv?utm_term=40+hadees+in+urdu+pdf PDF link annotation
    • https://securityguardsupply.org/php/uploads/file/50283843779.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5e69a9410a41602298eddbfcf4b1f1e5/vevonogiwuretotebaze.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210714_F106A05A0F018C3F.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/xukamitazuzevuf.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095600caa0b4---60697580833.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c536e7f006---59626414142.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/melekuritodatexizabodaf.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/1j58obrs3dt1e6v73gi5tqb7iv/temulifu.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/xokizinafepikogijepoli.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c134b396b4f---vuzixelanekelo.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/85420000320.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/72093012757.pdfIn PDF document text
    • https://ikima.fr/uploads/file/fuvenepubikatenur.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/44469112278.pdfIn PDF document text
    • https://aneri12.eu/res/file/64840360387.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aae47b2da64---doluxudewegokumag.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/pp3imqsa8gmpb6b2c0akgj0ul1/dikan.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/32862650189.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0bd519a8bf263fee8a9441d80204ae4/dewivadunobusolepej.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/81142800157.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/befivuvafoxobebi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a20a4c2b68e---manemutudepagipilogemo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b120ee47f32---16320138556.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078df8c242d3---10433740650.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/49387849841.pdfIn PDF document text
    • 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
stream_007_off0001a679.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A679 37624 bytes
SHA-256: bdee3d02256a360a13600fd19813a02dd7d777ca5cfc11632fe3fa2533f61115
font_00_sfnt_off0001533a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533A 10532 bytes
SHA-256: a0c520481e5fe59ae20654212f20e900812a39e876901683424cbe8fb63f2bc9
font_01_sfnt_off00016b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18334 14056 bytes
SHA-256: 24f50a0c47c168227d44d21f624ef0d7680ce32464073f6542a3027fcbecc2a3

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