Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce1ff5c2744eb68…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 21:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cfe53e5f892a0c155a54ef16d4fd5c09 SHA-1: 44934d5b759f71b0dd769f2da3997ccd4dd865ef SHA-256: 1ce1ff5c2744eb68e0bd58c3eee159bc461c3bfaab15a8d2cf270307e1ac2dfc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on disposable or compromised domains, suggesting an attempt to direct users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://esprimagroup.com/userfiles/file/34083081847.pdf In PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd1e8c584---bokolozutatuviduga.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/27a66a49f3f2dbb6900949992535a76a/34211407089.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/b6ofg1salb03l8d6b695j50vl6/wadeta.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/lonezoxataxokupexexur.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/31486140737.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/30174656060.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/bedagavatujogakarome.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/44255142341.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/xebaxesorodunujefonibov.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/55549851448.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160881dd48b7f6---davexupusuvedulu.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/xazowagikozovemu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/55fae25d0b1079e56fd6c542d39dae81/6350872025.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/80316610437.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160eca127cef97---kowewagudijuni.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/0f342b4c1654ff9af0fb36226c780e99/wirevosodupof.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/xososelola.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/xoriduvavisapubupexomo.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/77473534421.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acab56a2bd3---wokejotumafirozojodi.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/61404480442.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/76g6jsekbg2eauossi51as7054/fodumakixuvototodezunotat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nbde+part+ii+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_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 10172 bytes
SHA-256: b2c9f553a33a4d0a904a96451bf0bec60f36f127a5387ba15a898c0e20e558eb
font_02_sfnt_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 18592 bytes
SHA-256: 7355531636b1bb8c8ddbdc45f3c38343291cc5403e3b70c118395c14c71807d5

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