Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f72d77138825a31…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 00:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9b2eff32db0862fe965eaf887170cd0 SHA-1: f15c0822a0a2a8c2d3e3e8cc2c24d0980b2c5548 SHA-256: 1f72d77138825a31330386683d76cd5e86003973f143fdad6d945f910cf4a607
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm utilizing compromised CMS uploads and disposable hosting, aiming to redirect users. No scripts were extracted, but the structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://maximaviajes.com/FCKfiles/file/12766218870.pdf In PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/bital.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210917174508.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161426b3edfb7c---34813159811.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/66714613826.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/gokivax.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/56290541326.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/nijizut.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/xujuzaxanejogubemeni.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/kagitovubeke.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/16102949336.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/326a2ef2fcb1b8e1fca0a41b75c764aa/11755072651.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93b37dc28---69429213019.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614110b7742a7---79750770731.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/tekovikoxufafuxorilolu.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/zojoxefetetobep.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/lifiwoferofemu.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/83237099847.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/budenijafotaj.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/pafosabowibotumozava.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/betibuwoxejegedabeb.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d00bc005---6007103038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=non+prism+shapesPDF 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_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 10348 bytes
SHA-256: 246529a8529d6b5a098405f2ef2b722119364b7a6c663453ed0d7ea5c18b5376
font_01_sfnt_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 19952 bytes
SHA-256: b4d2e532a5800dd86e1475fcc2b4768fbd37797d0197dce3375adfc558a61119