Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5917665954fb6e…

MALICIOUS

PDF

87.5 KB Created: 2021-07-05 18:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0150413d6b7771619617671c9e49d3f0 SHA-1: 9a67dde3ccfb01f99ca0c059dcd55e0e73c83c76 SHA-256: 5f5917665954fb6ed1a2578c22900ffdbdcda892476ea368b01689cd4c714f76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. The embedded URLs and the structure suggest an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23449b0fba---semomojifozebuxigajavigi.pdf In PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d0594fd389add1f5f809cdb9144ab47b/13574710921.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160834f127068e---wekuzapizorima.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/finifixoxasimulilal.pdfIn PDF document text
    • http://dytac.hk/userfiles/rubiwenejujigejorebiwose.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ob7orsm43jgpe3dvr6n0iscbm7/xurudusotugukosaxe.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/nitovikawodotog.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/nugomagigubabelokakupekat.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c050c15b76---67528083949.pdfIn PDF document text
    • http://rilta.net/userfiles/files/regotasifelu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/n48ffk969qfi8lcih46ogc44k6/tuguzamoxaxabufapemasuzo.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/15a538ddd9b9b11cebb858886d64140f/noguguj.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/2756749591.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58303a2c4d---vuxibuvudobelunizakejek.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/bozotugozokoxok.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/47897b2b82f1059b6534b809d88a9673/7251225095.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/63292299748.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092c91842523---tetosivujeledobovigu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a7fca395---98564193193.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/af16ojv97q85afebs6ot69v746/goposumizuxu.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5fnfij51nshl5a34n43g0cvs5g/riwufevo.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/zofeze.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/sukobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=place+a+meetingPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0b32eaf9cf398c4509279fffdf2edc3a/wegutisumituzazuxobuwiji.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_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 10188 bytes
SHA-256: 3ddbe70182575c7cdeede15053cfd6bcea614820af2be20d8c869226ad65c98f
font_01_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 18188 bytes
SHA-256: 5c1360f8a769973218def7152f91f3f53abe516294fac6eb2dba5a313eb4b47c