Malicious PDF — malware analysis report

Static analysis result for SHA-256 652227d21f764581…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 02:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0476b144a29f3e466a4d6059141a2b73 SHA-1: 462d8a2842d1bec7a878c52f8872a5788d151f16 SHA-256: 652227d21f7645813a92b5deca38492fd3d134837ab196043460cdf7b5349577
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7429

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=thoptv+indian+app PDF link annotation
    • http://sigmabhp.pl/userfiles/file/38598353840.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/51399985032.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/19645582697.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/90935154497.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/retujisumavamuxalapuzuw.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/54620447243.pdfIn PDF document text
    • http://teifsepahan.com/files/file/44491176694.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/38717428974.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/98005595588.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bcec1bd3---xozoniwigamafofivi.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/6852873572.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/jadivit.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/pewulomasinebit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138543ae45fc---41702164787.pdfIn PDF document text
    • http://sdes.in/uploads/difujaruperoje.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mirarafovoto.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/46383232148.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/2051889550.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xatelolobuwanuvumuja.pdfIn PDF document text
    • http://taociren.com/upload/file/210908000247915752ya13w5x96tal.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/27095887700.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369139644cd---97705655196.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 17148 bytes
SHA-256: 7fc8c780180be574502e17c4b7a6b790481ad5dc8e06b73a06f42f4b924c3046

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