Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f96f1a29a12563…

MALICIOUS

PDF

85.3 KB Created: 2021-07-06 21:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3a5e4dd29d334d9e57939aa1fd348a13 SHA-1: 972d3637915a71c3c94511ee75e23fbc92ddc8fc SHA-256: 62f96f1a29a12563a84357011b981d327a7a475f259c961d2fc0ffa512ab2a52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan attempt. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware. The 'expenses claim form' lure in one URL indicates a social engineering tactic to trick users into downloading the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=expenses+claim+form+excel PDF link annotation
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8207060a66a044c43f5818cfbd884b4d/22239302698.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4549d3bb6c---82948039180.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/giligakilanuvisub.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2d48da15---47868724129.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/81237987676.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/sowikapomupoj.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jcb0aemv6g45lcccc5mgjuqmp7/64039759852.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/kororije.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16071e44f11c3d---mexazokupajiratatotud.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/13287002211.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/2034694934.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/robeloko.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/9qac7sqau9pij01jobdb7pv69g/25988105880.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/zefisewawoxejamujijexi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/402edc4e374327b8dc72fb476a98e469/71761821653.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/23822735796.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef6a369d2---26806305317.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/jits6r02f1kkjsfhd6uko0qtm4/50010689828.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a8290ee812858a0165587a8d1ed2b635/63822008660.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc0852ee4---22101844887.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/bigomefox.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/ledesubimelenevukulumesal.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff06ecd8d5---benebikilar.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/vijebavukekarebokiwotelu.pdfIn PDF document text
    • http://clarasonic.com/upload/file/jodepofurus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 17208 bytes
SHA-256: 36ad353129146321e6e630af14cc024a1f1224e28136c8956eea09ab01201eed
font_02_sfnt_off00012fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEA 10628 bytes
SHA-256: 1e00fb321acb997d5aa22798c4b344a1415e96f6659396a5f0191d7623a16814