Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22ff5e978d1de2b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 09:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d4dc9fd87df96c93a93086d4cf7e2ad SHA-1: 1b55b1eab2ade008fd1b418ef0ef846b99eeaf74 SHA-256: f22ff5e978d1de2b905521c39215482954a330b00dc351003f9bb25152fe3452
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=how+to+unlock+tablet+pattern+lock+if+forgotten
    • http://duoctruongxuan.vn/userfiles/image/file/97443882957.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/nobokumujelukiterubelud.pdf
    • http://ltpbetel.ro/userfiles/file/vutukezelijugavi.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7b85c9a460d946b0e7afee9ddb44a9df/22854368999.pdf
    • https://unaizahic.com/Files/files/21024624031.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16142b57c78f31---tafiwubarabalufo.pdf
    • https://ou-ravda.com/ckfinder/userfiles/files/peposolosazaluvofop.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/364ce5e2da85480d14bfb87dbb5898a3/29945687104.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/rowogadojan.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/63456816871.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa3b965508---73072084911.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4d8d514cbc3ecdfa392988d103948146/bopovozemijo.pdf
    • http://sns-russia.ru/userfiles/file/mokamozomep.pdf
    • http://ndc-group.ru/uploads/files/1448334169.pdf
    • http://morakothotel.com/file_media/file_image/file/37048956546.pdf
    • http://www.haztartasigepszakuzlet.hu/pics/file/12142416098.pdf
    • http://kaithompson.com/userfiles/file/jodejolazeditoj.pdf
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/31484935711.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130202f22419---joxipuxebemawunuvuleda.pdf
    • http://www.poliklinika-hb.cz/userfiles/file/96708901903.pdf
    • https://faguaflowers.com/images/admin/file/nonolakixemawo.pdf
    • http://hightopeducation.com/cms_uploaded/file/gadotuxin.pdf
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/40965464075.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_off0000b850.bin
84e24befbb4b0663ab2bdb3513c7ef270e6aea092b09a29f85515650b01a12df
pdf-font-stream PDF embedded font (sfnt) at offset 0xB850 16740 bytes
font_01_sfnt_off0000e312.bin
21a25fa728f1eaeced59874a0d3790b3cb07686eaf71cc31c35998146622f1c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 10896 bytes
font_02_sfnt_off0000fc3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 16792 bytes