Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e795eec8470470…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 22:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f74719b738ebd294e6649cc9f9f7d4c2 SHA-1: 82a5e93c1f4a5a66195ea2cbcd367ebe2a4dcce6 SHA-256: e4e795eec847047069bcbeb6c0537e279a346ed4a261c97213c5ffb079b32019
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of multiple external links is the primary indicator of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=computer+networks+mcqs PDF link annotation
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2mi89jiiro89kb9ucoens36tk6/10516942854.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/xulor.pdfIn PDF document text
    • http://digifast.cz/userfiles/xaboxewowakolabipala.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/67988a4c2e29fd585e2102a2b916e8a5/61214555545.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160932302ac45f---52788184536.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/73869496816.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161083446435ab---luken.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/10006997747.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/bexupewepi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b728439a937.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/xinefibaxujiraduvafubisi.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/jubudasatinufamivogizitag.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/58469002593.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/29434725306.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a4f4b0acb4ea8f8d73928d9acc38f9af/jixedebudef.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/b291b7ecbfb3bfde6e1a8e4c9c990940/41441714900.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c23376f95a2259246d3c378113c2afea/legijavikivekum.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/88062885430.pdfIn PDF document text
    • http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/rivifikisudavutexama.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160fb13402719d---36561461717.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/dubezuvutus.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d325ea2c3a7---86885227907.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609025715b893---fobopuneroresibolaf.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/csdsl4aasam5ll8hlqoc1d5ut5/43555491001.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/14020926786.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_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 10692 bytes
SHA-256: 89d0c3a181282a297e50615f3d3ec6b598f703c4870a1c7fb3332ccf524aca45
font_02_sfnt_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 17200 bytes
SHA-256: c0a3c856ae42b48c7442b36b4cc6fa88a417c795c31da0151d67a5ae493bbaa4

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