Malicious PDF — malware analysis report

Static analysis result for SHA-256 b906867c7fd53ef4…

MALICIOUS

PDF

97.9 KB Created: 2021-09-03 08:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d1244851a72ca477372aeb4980e0fdc SHA-1: 1abd8d2276475cec3c317c642e53ff71a8705407 SHA-256: b906867c7fd53ef4ad68d484686f1f2f163af12c591f8b20f30ddc6bbd41d174
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The presence of multiple embedded URLs, many hosted on potentially compromised sites, further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16108f34776163---64632182403.pdf In PDF document text
    • https://shopinhome.com/ci/userfiles/files/31765650064.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1623515072davazoxanosajibalow.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/mivivaxij.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7952f6c50a---59484847244.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896128ec82c---didezaresivekiginel.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e329a9db9b3---16912261837.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077202a1d5e9---vubufomixabitis.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/63438859424.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/60528849699.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719005f2738---73792493602.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1unkeuojr2ad87llcd8703qict/wekorugufigalek.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/79362278171.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/61519367427.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/xitenozenapaxod.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/fugozenebuzazamuben.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210604124359.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/vosutu.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/xudazuxokabanozewepusevex.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/94381385394.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/zumisitapavumanamuxiz.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607832211734a---12966847416.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/jafuxafufavunazelipape.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/95934047589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cfl+stats+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_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 9976 bytes
SHA-256: a6b09a0d3b494391e18f707a2b86df41fd6462bbc4664aa867d8efa5b052eac5
font_01_sfnt_off00013435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13435 17620 bytes
SHA-256: 631ed2348be66a4df323e9a1e94a51cc6ad9dac1980ead1a27c6b72d9a4cf24b
font_02_sfnt_off00016227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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