Malicious PDF — malware analysis report

Static analysis result for SHA-256 150231c024c396a8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 05:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11395481bc13ae9370e0cac245976c81 SHA-1: 2cd368faa8c7a2f466d4c7ea1fa9530a0158e3bb SHA-256: 150231c024c396a809832e0d03378e9433fa37d67f36768dca62cc2177068bc1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pistant.ru/uplcv?utm_term=ranch+simulator+download+apk+in+android
    • http://myphamasia.net/upload/files/36753072824.pdf
    • http://vivo-mebel.ru/upload/file/41704085062.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/nudow.pdf
    • http://ahnil.com/userData/board/file/wosapukibutanono.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce078abb96---pivode.pdf
    • http://flairpens.ru/uploads/files/55135059162.pdf
    • http://way-of-spirit.ru/upload/file/59955516436.pdf
    • http://hexindechem.com/upload/files/55114339584.pdf
    • http://aven.su/userfiles/file/fupavifewopinanusezejak.pdf
    • http://hongshengfish.com/uploadfiles/2021090402073973970.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/12956793447.pdf
    • http://addisonplaza.abwingsmd.com/uploads/files/79431459819.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c07f6339d4---bataxopejufis.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/561f7f925e4247c7016206389534c1ab/ruluxuwezazutetoxu.pdf
    • http://congtrinhnhaviet.vn/upload/files/83972257879.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614916b62413e---dixamedaruwemodabar.pdf
    • http://thietbikhachsanvinhhung1.com/upload/files/vatinarotixuram.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614037e8c2eed---39186061756.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16146a953ef3a2---66387617631.pdf
    • http://innova-perila.ru/upload/files/wegofikolokuxopejejit.pdf
    • http://www.look4job.gr/images/_user_na/file/32753599631.pdf
    • http://odpadykj.cz/UserFiles/File/rezot.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ed638d8794786000fbd612e28ffaed9c/35579819394.pdf
    • http://vandientuchinhhang.com/upload/files/demazemazuwewi.pdf
    • 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_off0000de3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 16792 bytes
font_01_sfnt_off0000f64e.bin
187ef2a7f377c16f21d2a11c7da69c2975c6545e31a26aae4d2727e038a6d158
pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 17200 bytes
font_02_sfnt_off0001230c.bin
6726f830d2c1af28fa75e85c63f8a108ffda447b3253fea943192e7c53b415c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 10968 bytes