Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6b1f1ecb946753…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 05:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab38921b88683fede8c3f91fd98a62cc SHA-1: 04e167974fc2aa559a3bd7abcd43f4306958d799 SHA-256: 4b6b1f1ecb946753c0d33c0fa2a24b1db4002f2f18c2bdaaf537e628c494cd50
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of 'utm_term' parameters in some URLs suggests a potential phishing lure related to 'workplace safety manual template'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070b1df0a707---47242582054.pdf In PDF document text
    • http://kientrucnhacuagio.com/upload/files/toraza.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/9st5im4bpnbp6fg29r75u4gtk4/48148700474.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737e392ac42---19800830308.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-8-19/20210819225724715163.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160949c56cf8c4---50505236739.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609627ba98578---18694225515.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/93166627671.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3f927dc3---munit.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/tenut.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/zolaxolewo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609957784acaa---21680543070.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/jubowidumabinowejulinas.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/kisuwasakuzogide.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/87e8af3beca5f4bb339f2539461a9e10/12797737231.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rv8rvmq5g0i7ppe9v50i1teldp/mevaromozidulerimagobatub.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/xazuxadakeb.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e7bc47e58bcda99d1b38cf5932ce6a59/sibevonemubudi.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/garikib.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d473fb833e7---25378935926.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eded428e595---81550915254.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/31779657486.pdfIn PDF document text
    • http://scantech3d.com/files/taxusekesumezadizega.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/toludopafitanowat.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f9cd106c6---52661331980.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6852judr01j1jm156j07937be1/sizobazenatezodolaxapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=workplace+safety+manual+templatePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f7c3d4fb5908ad2b293dfc73b380c9ed/8384532495.pdfIn PDF document text
    • 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_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 16096 bytes
SHA-256: b3954dec9579613c9087fa72a5731cd41ece7de3fda6358bc91357a9a7746336
font_02_sfnt_off00011de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE4 10848 bytes
SHA-256: ea7996d6f54e027009e5713f38b416ea6f3cf73b0f7d76ce33ece297bf28d2a5