Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e57938161a0a70…

MALICIOUS

PDF

94.0 KB Created: 2021-09-11 14:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7261a6c56eec4912063a3428a9ba8ee SHA-1: dcea3223cadf82d286578dbadc9b298cfbc81c97 SHA-256: f2e57938161a0a7060807ab7af483204e8313e60137392ee4e6a7f9e26d4d37b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://ctyhoanongangiang.com/userfiles/file/dagorofosebuxi.pdf In PDF document text
    • http://cadelupo.it/userfiles/files/26992429612.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090810515580554.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/pezale.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161366707cc036---linutu.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/ratinan.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/73256252963.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/wutasasusug.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f14a0653a4e5a30f052f2252fb77dc67/49731951656.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133d84358bd6---nadaj.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/27804846114.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be5aab37387ad0b974cdc74dc9daebb1/77821186489.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea1e0c49f---xifivoduri.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/10935315256.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/79789603392.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2e32803f---82143234329.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/bosajuvawikomevom.pdfIn PDF document text
    • http://firegallery.ru/img/upload/majamujusod.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/9013826459.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/43652618811.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/19817059512.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/46254782611.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/vuduvolivuf.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/wobijadademozipozofodor.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/majunuzilonemowoxuxibis.pdfIn PDF document text
    • http://apismorava.eu/docs/52442838985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+offline+android+car+gamesPDF link annotation
    • 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_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 10872 bytes
SHA-256: 5c6ba24e48e794eefd94af9eea7203e6b2358c7e54fdcfef4e7e4f3f45f3b0dc
font_01_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 18120 bytes
SHA-256: 839f54bc1939c2b680044defacdee53f5be864a786171abc8e67f23584046f40
font_02_sfnt_off000151d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1