Malicious PDF — malware analysis report

Static analysis result for SHA-256 a452dfe45984dc2b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 20:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb324141868cf8e2c98fc1638d72a704 SHA-1: ef50570fd48824c1ffd2b293632c2e9685bec920 SHA-256: a452dfe45984dc2ba291b1e237d2a4c8af0bd9da2f314fe2be4208d873f3515c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607113380cdaa---56142726287.pdf In PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0784929c4f33c75e905e5d41a49319ab/sagozosed.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/46250577655.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/72013650916.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/61816050755.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/48ddb1mqoucsat1lmshbbl0onv/95573107436.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15d9d6d584---viximejonawebupipuwupe.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/visafajulebubozoturim.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/43762352343.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f0085094d---52917505209.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb0095fddb---81185639757.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/po98kgvcsotgeeitmt6nub18pi/fudavegetazuworisaw.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8749a4e17b95c4c73e081d02cd71f061/8885055799.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/egirn9rcns4l14rce9gdls1uh4/fedupevigusonirepadenof.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/melomi.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/zabetibusoromezogu.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/25820127294.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/danukejobopujal.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607badcb1204a---pitebisobenolo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107fc835139e---41500801653.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e26f89d984---39371406267.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/wevasomomisefuwubit1630010221.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/25179694025.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/10002749122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=200g+butter+in+tablespoonsPDF 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_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 10812 bytes
SHA-256: f3395c3373b8b94d9dafc2da55405df3fa5ad1e0efce661e4ff40ba508dbdd0f
font_01_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 18080 bytes
SHA-256: 38c7fcdd2e4158c010b9e0e38251a901b32cbd6036e2873808e3fefa92d054b3
font_02_sfnt_off0001241f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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