Malicious PDF — malware analysis report

Static analysis result for SHA-256 c031bb3e0d75c9a9…

MALICIOUS

PDF

93.6 KB Created: 2021-08-01 08:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6d748b508943c9c581d0bc63bfd9adad SHA-1: b0ac3cc9c905e167d719ea67fb2eedfe8a2b52bf SHA-256: c031bb3e0d75c9a9c741b445e087f310da7d561098641c92e722ed687c703c61
204 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to host malicious files. The presence of a 'password-protected archive lure' heuristic indicates it likely attempts to trick the user into believing they need a password to access a downloaded archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087e50d1821b---33793509902.pdf In PDF document text
    • http://studiopignotti.it/userfiles/files/vusimijoki.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16074aefbbbc5b---35414800814.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b740bd3e8e6---fubafe.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/12876278766.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/77955992722.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/08jjnr9ubhi8269je8l85pak11/29581881555.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b4ab75fbdc3f46b9cbb60470a5720d88/32369949646.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160720f8404496---42764815132.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/odgs05u4ff7bm1ba3u6ud6hel5/95922278531.pdfIn PDF document text
    • https://hoongnau.com/upload/files/56515237834.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160818d6f9e0ec---11213200759.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/tolofivineko.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vugelagixef.pdfIn PDF document text
    • http://short-story.ru/upload/file/xunabixipixiv.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/49702135954.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/jcmgapdvhh67lsmh38kehsb9k2/20744141253.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/turamalibop.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/qdfkt3sbrv8fv7lbsufh69471o/85675851455.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080bcd2989f7---74390083724.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a63ada79e---63318395978.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/94d6888f1e16f06b3c230afdeb4d06d7/kuwatedesazap.pdfIn PDF document text
    • http://apex-architect.ru/images/file/veninuxavodetujilugulapa.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/vuvixaferegabofenarovik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+gta+for+android+highly+compressedPDF 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_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 17844 bytes
SHA-256: b53e5efe8af59160417ce604a20a066e2f09f3c503aaf426484ee6177f60885d
font_01_sfnt_off00013671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E88 11268 bytes
SHA-256: c89f3dffa8c0c464db82c238394ea1bdc9ee36e8aaa72f3904b3ed738085221b

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