Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af0616aa1ff6956…

MALICIOUS

PDF

87.3 KB Created: 2021-07-21 08:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2fc17329db696f6b6c13f37ad677a14 SHA-1: d8551bdfa70a0c3f9605150f877501feb93a8afe SHA-256: 7af0616aa1ff695682ca67e8f765542b7cebea8a44d4ae9a18297f2b969847c2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to a compromised WordPress site, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of numerous links on disposable hosting and the use of 'utm_term' parameters indicate a coordinated effort to manipulate search engine results or lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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 http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1c41265c---zumozabupimolivik.pdf In PDF document text
    • http://hrt-foto.hu/_user/file/xosixikajusagukulajaxuwa.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/tojawuzanasefi.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/nosotogusofofuku.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/40a0vgb01dtklvi6tptjlmc63t/54755852895.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/f2kam41678ulagu35i15cnesbr/8553238954.pdfIn PDF document text
    • https://actorconseil.com/files/file/femetas.pdfIn PDF document text
    • https://tl-systems.hu/files/files/jizemoxutixa.pdfIn PDF document text
    • http://abpaluso.com/upload/file/gafunazegozu.pdfIn PDF document text
    • http://goref.ru/files/file/81080824595.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/dunukanuleg.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e17cf0fa---lapelimogebusupopokagul.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/nurexid.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/jamafafilemuxebebe.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/xowofijetojexusuxapogo.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/831ea335e6547cfef5fd524f849fbffe/51215469404.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/sg07mmc2p6vjh5l36tvqaklj1g/86448242831.pdfIn PDF document text
    • http://houselandia.ru/files/13539734059.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c0973f48---17854911955.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/tijewapase.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7f9d133d1092eb6dd927025b6959c3a1/54738034775.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c850ccbbfbf---gudaderimuxejaruguw.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/98684660650.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cvbdvraoq1jquiad51hs4q9ii5/87390345152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gross+pay+meaningPDF 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_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 18660 bytes
SHA-256: 9f1fb45a302ba11d7fba5c82d51decb7a79c765c1ae6dd42cd55b773243ed0fa
font_01_sfnt_off00011f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8A 10604 bytes
SHA-256: 7b9e1dd5fac1853b08c538c57ccd51eb59d0c742512dac180821dd398e85af3a
font_02_sfnt_off000137d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1