Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3de90f2a294b34…

MALICIOUS

PDF

74.2 KB Created: 2021-09-03 13:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef03f073bb91dff2da7a4a4a34995dc8 SHA-1: bec5a88dd44b77f9b8f748f34042494ba486b753 SHA-256: 7f3de90f2a294b34a2757c1298a3e7692db04d22dd8cebdb914d005be62bfb05
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to potentially compromised WordPress sites, suggesting an attempt to host malicious content or phishing pages. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4e81e61e6baab2b8ab7f46ff43a7d0e0/841583625.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b8n527edhc6jnuab2q667vi9cj/vowisuledesodufamake.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee08f153260---genazumatobiwuwame.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hv4ni34je0jg8t5gpjhhdv20dm/45299469877.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/c1b09bd8cd511072cab95816cbcd285f/femejutemukotalubuduzojom.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/18hgh3tieitennqkaf5chtkflv/6854381442.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/devozefududimesugiv.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/5740278846.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/439a3e7f9a33da90c06f8a91ab4f7f53/wafoleruvu.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/donera.pdfIn PDF document text
    • http://elanaclub.ru/userfiles/file/talukiwasumexasazitifokig.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0f099594a05ff7c6dd391cae808b15b0/lulufubu.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/72095370245.pdfIn PDF document text
    • https://deepex.hu/hirek/files/dezeweboxazopize.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/akgsb0graqqermds2p85uo3t91/59070316989.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/pitupibusenowabuki.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/99039587223.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/33600345875.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/sonezuvowitewalememema.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983feb9c969---kawenikunaw.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7a6iufv6r6jud5glq0paou9i5a/32350512350.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa387ad0d81---lazisagukuve.pdfIn PDF document text
    • http://amdind.com/userfiles/file/ponozigigumuvulego.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/kumizotazipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sloan+manual+flush+valve+partsPDF 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_off0000bd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2F 10772 bytes
SHA-256: 88ae38f5eb994b99f52297b7e0395ec8b6f893eed1fa2f0e04fa31433496d23a
font_01_sfnt_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 16876 bytes
SHA-256: 69d6a4e0c6255dfbce970e9c3a3a9d88b4831a2dfd3d9ff7fac00965a84676d1
font_02_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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