Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c308987b69a4497…

MALICIOUS

PDF

73.9 KB Created: 2021-09-29 04:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 20ed3a3bb693213431b97dda5efa9661 SHA-1: 5ee5b25303d9b711a84784a7af768d9f33d53c15 SHA-256: 8c308987b69a4497228572bc3cb08bc7a715a16cf6e774ff6f928ba23a4ee469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns suggest it's designed to redirect users to potentially harmful content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615200af1d962---rokavojimanamepekivave.pdf In PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/53869607447.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/xabis.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/gugazumupufokirisijun.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/94731544854.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/vatixoladegomibiwa.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/zijinitalisuvubemoxa.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///71019769164.pdfIn PDF document text
    • https://maria-galland.ru/files/file/pozarerutadanogijan.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/rutogapovo.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/27762294341.pdfIn PDF document text
    • http://tvps1.juicy-group.com/editor_upload_image/file/lakelud.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/7654855227.pdfIn PDF document text
    • https://lecachet.fr/docs/files/36402711608.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/tadazarewolizexo.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/49936973728.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/35080912542.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/wozoberijoferagiruxole.pdfIn PDF document text
    • http://195exim.com/datas/files/43450206754.pdfIn PDF document text
    • http://oiacreation.be/userfiles/file/8704776638.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/rajanogovetikax.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/xovopegada.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615213c58e884---14333758673.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/915b448a065a4a4b7499a632c4142557/zasasafuwizezoja.pdfIn PDF document text
    • https://stopserv.ru/files/file/rufilifalekizesi.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/94480040204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+tv+pornPDF 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_off0000b9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 9924 bytes
SHA-256: 95ec7d2fa71f3a6d75baa6d03117ca20014e92108d39089b85882539acaef2cf
font_02_sfnt_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 18752 bytes
SHA-256: afd2a927e4a31e785eb3067a58b02060879548d0b4a10385ac1e9c64b50783eb