Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f309d6a567cc69c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 10:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5965529af372dc07dcf4e5575a5364d5 SHA-1: 83d3d98b13254cb570fa8487b7c375467b0490b5 SHA-256: 7f309d6a567cc69c1ef9c9dc028f89817b43d0526ecd70b500629e566cebbd0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://oticonshop.net/ckfinder/userfiles/files/lonik.pdf In PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/12670947197.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/wadikavinusojoxuvisot.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/fdeaac1c14ee716b3e715484886056f1/21066410393.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/17551844655.pdfIn PDF document text
    • http://bociany.sk/media/file/56178603964.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/cffa89579de75764e51559fe395bef63/jopotesaw.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cbb82b527---xuxapibusu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e58976c44f---92918180968.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/96518072473.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c92605e7c---ruxexuvosukalimowejipid.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/2844857620.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a404553ad25---95635067264.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/i5epmr0uuv41hhujm7eu6rsgq5/rolopewowozemumebe.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/14919309633.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/50972732475.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/28425342293.pdfIn PDF document text
    • http://xtra360.net/campannas/file/76683854020.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/96824360049.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b222565e0d9d4ca29c96f583e63f24cb/39094931705.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/xogifetemirupizetenako.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/hsai7nafvo3q6ae8fmv146sjv5/94766391063.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8e3b8b11a---moliriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=highland+forest+trail+map+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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 10936 bytes
SHA-256: 49c5c96d0cffd335548d94cc4a6fd69adcc79a2397128ed4073518dae909e7ec
font_02_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 18708 bytes
SHA-256: 68bd3f9a848c800c14b2cc5103567ef7493415797c4dadae6769cb9feb1b7548

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