Malicious PDF — malware analysis report

Static analysis result for SHA-256 adba5ab2256e7763…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 04:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 67061344997b42092297c0026953450c SHA-1: 97fa5d713c5222ea3a521e367b1b35c5128e6d91 SHA-256: adba5ab2256e7763f3c275eced39967e67d302ad13b650d4ec6e0bdfc80ab1bb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://posh.hr/files/5767069211.pdf In PDF document text
    • http://tobn56.com/UpFiles/file/9043438946.pdfIn PDF document text
    • https://t2sc.me/userfiles/gupofed.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/70258830848.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f20660cd3e3---waranenavaxiwapibu.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/6084792777.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/75962373403.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/pizinasopukifametukamava.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a452e3732---pidafem.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/30498794514.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/pajuvaj.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62eddd8262---toger.pdfIn PDF document text
    • http://waypl.pl/upload/File/daludumidebekixujogab.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609743b744713---26212673946.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/gixif.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v0sm78pq7sqo3rbum6c5pku3h7/femukiso.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/rugezexorixateli.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/74344490848.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/16004014108.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/95806243398.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/906q1g499hhg402qqac3fu5lge/nimolir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=breach+of+contract+lawPDF 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_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 16392 bytes
SHA-256: fbc1ea5943303ee3440d55d8cb91a76ae25ebc4453f8cfbde3c2da4559096f52
font_01_sfnt_off00011636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 10312 bytes
SHA-256: 1c56bd721c17e9a401ed013c62af8ebea767d70cd8f213fe8c37ff8d2cf30680
font_02_sfnt_off00012d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1