Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a8d032a39b650e…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 22:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6293f38d5281380a97276937dbd445e SHA-1: 068229b495c9a87ffcc931859c830ad4ed311ba9 SHA-256: b4a8d032a39b650ea30cdbc09925f0ea61cc1506a4a19cfa5c7c746c85f7931a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or use disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://kaies.net/upfiles/file/rolobobumimavamipujejomep.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0fb9609a2c5302777ce6a75ae7e0d6c9/26566809680.pdfIn PDF document text
    • http://agro-partner.com/Image/files/fedibileguj.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607037fc4d559---falujatemokonafododupu.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/95787011586.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/viwedegetil.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/a6pi2ca11sji8mqbushm52ofd2/51509381324.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51784c2f04---zezubunudipopa.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070dc3a99b2a---38305508039.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/75643204194.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab5f2871b---kimepezudigaz.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/48408752485.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/lazirugalubarawabibeg.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/seforekorarojinofuwutox.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210519141644.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///44098897523.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/82914640638.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c037348bae6---nuzuzakolun.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e108e52ce---52007158368.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/17aeb749c108ed160750a949a039a641/14641696809.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/14171100412.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/bosivapewixanebedirunan.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3aa4a3da---fakubek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=nissan+x+trail+2006+t30+repair+manualPDF 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_off0000bfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCE 17204 bytes
SHA-256: 38d688be5aa07d8daba7582ff446c9b8ef1d865d6b99e6b750e8f83b70f15749
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 11052 bytes
SHA-256: 79d4cbe0c9633c3aa5e3841ede58ceefcec0b7feee6a9f08083f1dab7a4607fb
font_02_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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