Malicious PDF — malware analysis report

Static analysis result for SHA-256 7192c82ecbc14e35…

MALICIOUS

PDF

91.5 KB Created: 2021-09-20 03:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4d706df536b3377083317825d71bde5 SHA-1: 1d4a3796f5f9b006190549f6f878ca6e07f7a3a1 SHA-256: 7192c82ecbc14e3553f7021428a85711759c8617b22403ddd541b537f5ccdb1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/r9ib0km2gn9vut893rf1s4rjq7/pefazukapesudomiwurewu.pdf In PDF document text
    • http://malir-naterac.info/UserFiles/File/xonovevuvejikusuxif.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/lasepasisariwer.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/6122458134.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/bimazuzifovafixawarusi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8eb674436---kodejejoretibuzoje.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/35691530046.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/59706984784.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/vinadodorewiwakigoda.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/11885369072.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3f14e7aa---59694394557.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210911195343.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d6b7921c30ea175cf8263e124d087da/45867441388.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/44860972799.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/fipetixisexukenupu.pdfIn PDF document text
    • http://glassick.com/userfiles/file/woxavobajerasa.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/bapoxo.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/rapanevoxemelole.pdfIn PDF document text
    • http://precisao.org/files/files/lodobajiru.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/rebuxajuzumupet.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/kulepo.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/luzevejonoritad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=action+movies+online+free+full+moviePDF 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_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 10484 bytes
SHA-256: c682ed7b256342bff158384d983a8470dbdf2b0296ecb101bd86082d76e35b14
font_01_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 17228 bytes
SHA-256: a4c8781b6295553395ca969ecdc3436b3f3935ba1229d0d8eddbd8eeb9335485
font_02_sfnt_off0001480f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1