Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b5b8c8a168221c…

MALICIOUS

PDF

72.9 KB Created: 2021-10-05 02:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0f9e765d9d19ec0c282478061a125c9 SHA-1: 147acfea3b0f5fd40d2c703d90b4876eeb31a831 SHA-256: 44b5b8c8a168221cd781eaef13fde40726a77f0abe68b51c2bd43f3a1756c0a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting. Heuristics indicate a link farm designed to obscure the true destination, and ClamAV detection confirms malicious intent, specifically classifying it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://f2h63c2.ip4secure.net/upload/files/mafawavijisakuvixiwo.pdf
    • http://perevodvnegiloifond.ru/pict/file/28545447700.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/25672374629.pdf
    • http://1night2day.com/ckupload/files/rebugonibigaxa.pdf
    • http://ipayon.com/root/FCKeditor/file/73801730104.pdf
    • https://www.indoorclub-informa.com/boletines/img/file/71209162509.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095529eb0c---vipixi.pdf
    • http://dispensapertutti.com/userfiles/files/13455687294.pdf
    • http://szwygs.com/upload/depimajow.pdf
    • http://atanasijornet.net/uploads/ckfinder/files/92869969324.pdf
    • http://harckocsik.hu/userfiles/file/getimapedemis.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143010242133---veparapexudepajizunasowu.pdf
    • http://circolonauticofavignana.it/userfiles/files/betadotoxosakabubemar.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143533ef2dd3---pelojuwufanugafufovotin.pdf
    • http://air-ned.com/uploads/files/55960802310.pdf
    • http://kes.org/upload/editor/files/92461261253.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/33fbdceb7d0f22cda5c377f79b04ae7b/nitewezumar.pdf
    • https://gifarlcm.com/upfiles/editor/files/navav.pdf
    • http://botaierpharm.com/upload/files/zapas.pdf
    • http://sushigonewildtogo.com/uploads/files/95908788982.pdf
    • http://dolphinkorea.com/files/files/lifunisipoliporovokesuduk.pdf
    • https://divinenine.net/userfiles/file/zomutafojapufiwowi.pdf
    • https://neurondevelopment.org/userfiles/file/fexivovu.pdf
    • http://king-pro.com/userfiles/files/58815031923.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=knitting+sites+other+than+ravelry
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bde8.bin
746b7c87e0d415de028177300d2831f8bedac3c391363d02723b5af14ec43829
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE8 15552 bytes
font_01_sfnt_off0000e628.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 16792 bytes
font_02_sfnt_off0000fe3f.bin
fa24ae5b2d56356bb5eb912e15775d99c6a4fe4cabd519ea938bd6cf49fe597d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 10560 bytes