Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f03d52bd18cc46…

MALICIOUS

PDF

85.8 KB Created: 2021-07-08 08:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 960bda69dd61338aa2d7c4447057b0de SHA-1: b878b86370e87090999943838872bce7c64d639b SHA-256: f4f03d52bd18cc463a20354d5b6f12358388a465aacd0bb4e539c0772199875a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external domains, many of which appear to be hosted on compromised or disposable infrastructure, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL findings point towards an attack pattern involving user interaction with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=how+can+i+report+my+landlord PDF link annotation
    • https://x-software.cz/data/file/jopiwepitogujenosusopal.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7dcd9ed7bcf01c49ccebbf8fb11c0382/rafuketusike.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/jupulig.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f288e6d25a---90084601312.pdfIn PDF document text
    • http://billsky.ee/files/file/69136690256.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/1559561820.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/n5ba78sgm9vnrh5gc91ngjbfmv/povaji.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/mesawipopefurerewipom.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609071cecd7bc---ritureruvem.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/burimurulepaximudo.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/89023523374.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/39831604637.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/29352392138.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e399184a347---rosimofexepajupirajunela.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/xexij.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093a8a796535---kofuvademozerutifolesa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/85cafe3802189eefb99fa416433f5477/58932480582.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f6777567---zumupololotoleluviwedizev.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/11442594224.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16218562932695.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/7949104590.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6fa9c42c---73544654509.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706bd54b78f---647409343.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/xofodavigojomu.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_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 10696 bytes
SHA-256: bb4808d54e6b7341288108cc3f9974d8159b02baf0e0fe4ce65ebe5c5cc0c03d
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 17544 bytes
SHA-256: acaffe664fa4d433384099886ff383c099ee7585470f067abbc50cfaa8594607
font_02_sfnt_off000131d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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