Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4845958b8af362…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 07:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05305c247627ac04b33c75046b937c8d SHA-1: 6e17e64b44ae7bd8687f3ca814540c203518cd51 SHA-256: 2e4845958b8af3625e6597aade10514c8c3dc749e3bf5b03ebd7112593d15d3c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it contains a link farm pointing to potentially compromised domains and is identified as a callback phishing lure, suggesting an attempt to trick users into contacting a malicious entity. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://swiss-ex.com/muzukumewagupufevirokexem.pdf In PDF document text
    • http://phuocthuan.vn/images/pic/file/19636888036.pdfIn PDF document text
    • http://darec.sk/files/files/88011537595.pdfIn PDF document text
    • https://tomas-music.com/contents//files/degedadobujufetajepelal.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6ltnmbt9n7dafr6ogm1sbp0vr1/9650055492.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/9886459245.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/97752755106.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/basavazakekamasa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160717cbbb5624---51097200642.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3db38ded4a---71199935380.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aab640876c6---makirowiromizenolos.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/84529496001.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087078e74236---jofuf.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c230832f90612ef78b1a90d80c2d2e6a/ruvonesekutadume.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/ratetixamatudi.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a17e3dbeaaeb7f69cfeeeaa1dc9e29ae/xejaxukitajaj.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/kususizasexujofiwur.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/641aada94cabe89963d06d3585daa259/derivanemuzinajefirojo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a3d3e12496a4f499f181f874fd29628a/52821433833.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/74084442845.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/95322218998.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/86691677795.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095234090fa2---42992220430.pdfIn PDF document text
    • http://eternaseguros.net/files/files/30941015059.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/56035435034.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720f9b07bc0---safodanujujak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cfit+manual+pdfPDF 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_off0000e296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 10268 bytes
SHA-256: 281b1c0f8a67725af0c7a3599a9d0542a6a893b0e2805968a84923dacb3121e7
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 18064 bytes
SHA-256: 95ffb4d104a914b7eb0c24b9c881789ff645510314180b2d8b89eefa6c60bf30

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