Malicious PDF — malware analysis report

Static analysis result for SHA-256 667abb1ca7835852…

MALICIOUS

PDF

67.9 KB Created: 2021-05-05 20:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1755cec7ebbc45143b8e8edba5d90112 SHA-1: 41575395cd4d1df7dc400b96a6e00d028c60bb07 SHA-256: 667abb1ca78358528bce79f5dd088d5595ec00cc591ca55164f62fd923732bc8
164 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malware or phish users. The presence of multiple links to potentially compromised domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072481125760---51750680796.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fffcb7664b2091cc3e58c2db35479afa/68882379236.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/ed08cbd0b0024b0f05b543bf95677df0/58466160238.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798745dd3ea---56383724357.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce94fbc5eb---22959633671.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776e94f068d---boxosepolatatozi.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/28b81ee081f8bfde1cf50216d9e4900b/wufajimekobifirubepilo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gh6ds700tl6sh0fvgvu6hml3cj/kezaleberutubeseri.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7a2759562073e886fd7f59df79943f2a/37527510541.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f52d5fd3bfaaf1bdd6f747f9e9a9110c/mezojifivebatejek.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1e7f7f0c8b5fb02e3e6afaa007753a7f/saludapiwawekurixamotav.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/39832948686.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/87f4c835c75873e20db3b633003881d2/kokokavoxoramuf.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3559dc07---fesemugujezidawizunoxa.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec07fafd5f---mewiropukigeno.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf777e0d24---8311150203.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=churake+dil+mera+instrumental+ringtone+freePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBB 5288 bytes
SHA-256: 7ec6aa0469ddb20f6e371312a033f40217e39ae512f24e05db468e3ee42f8d7b
font_01_sfnt_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 10488 bytes
SHA-256: 70731fc2a4b8123564382f945be0df8b4c569909ce43dad1bee71e88501d791d

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