Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1247ad5e331629…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 21:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86b42764c44498138450e3b074b9b9c9 SHA-1: d6fed3bd00e2238ea49d320ba97b6a1a3a07f467 SHA-256: 2f1247ad5e3316295a7e48dbafd4945d106c820555fad2a0d1ea8714d366ad6e
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, including those hosted on compromised CMS uploads and disposable domains, suggests a phishing or malware distribution scheme. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://crysiq.ru/uplcv?utm_term=reinforced+concrete+gillesania+pdf PDF link annotation
    • http://studiosiciliani.eu/userfiles/files/ruzimisepuwekibipoxonu.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/54928865744.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/gifikewerefufukar.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/7776073740.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/cda5eb11ccf1b7580c2e53cec08a461d/94537237253.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/dacdae25328f87758b3ce3dd4b95cbaf/venusijafusa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce7889590---65198059049.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6663a4bdf6feb7a464e4bfae91e925fe/64919647354.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a986c84e6dd---bapomekimodefabovevaj.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rezetekaxoperesojipu.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/21718734423.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/abfa51369de8827deaba8327a0b5b2dc/63693447236.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d7b18ac943---zuwugulowokuzagapu.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/89949842825.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ko19ud3it0ms0aetsnce8ubd0/bupofilinuzupobi.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/gevimeni.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/34251761162.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/46093599887.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/lozirorizexexutopu.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/38329304842.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/poxebivivulirerubo.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/80329518069.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/05b04be240804ed8807933af9820dc3e/losimofonewupo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607226b39251b---73370583591.pdfIn PDF document text
    • 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_off0000bc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC81 10840 bytes
SHA-256: b784a7b854fc03fe126e56d3281adc9fbcad5842750a43227775901b63d6cac5
font_01_sfnt_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 15864 bytes
SHA-256: 4e95de037ef6ce021f26fae89b271e031c141aa1fda01a2df30bc9e109af578a

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