Malicious PDF — malware analysis report

Static analysis result for SHA-256 d051cd71d13be4f6…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 06:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3a8e1baaf20dec96af9165f016873e7 SHA-1: 25a12cfa2c619027088a8462fb931f7f903783b9 SHA-256: d051cd71d13be4f6ba7e253b553d1dc51a0e17e09c081e4dd51fb646ac830d6f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farm heuristics and compromised upload URLs suggests an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9b84f862---12637407426.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//70942122604.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090be1f6c769---jojir.pdf
    • http://asja-doll.ru/userfiles/file/wobuwobirok.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/17451116262.pdf
    • https://tecnibat.net/uploads/archivos/86715648405.pdf
    • https://nibrasimansch.com/userfiles/files/zimojivateb.pdf
    • http://vtaky.sk/media/file/46316554711.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/894701a1139c32e87ccf2c77905cc65c/35251195881.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a81cb6193c93a67d8a6907ceec846c0c/98824797641.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c4cf1ae8---zomuzunapigukaruwajiv.pdf
    • http://uctodane.cz/UserFiles/File/pisorav.pdf
    • http://westernstudioservice.com/admin/userfiles/file/75855121031.pdf
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/gepadasenowadigopagiloxiz.pdf
    • http://smcertificationservices.com/userfiles/files/5535237385.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/j87qhgga3q09vb1cf2t51vum68/sowowutezugavexabegujekip.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a847b5bb4e3---kozagobuxifelifikisuzuxi.pdf
    • https://biocoils.com/img/file/95659774494.pdf
    • https://deltarents.com/upload/ckfinder/files/28968910869.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/habi4irmboru4hke25cvb7qcoi/teponudonupuw.pdf
    • http://soles2walk.cz/data/file/87505225302.pdf
    • https://comtraining.cl/userfiles/files/jejalijawuvupoposogemixab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=power+house+in+hydro+power+plant
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd59.bin
ace0d0ec6c53c975ffa4d96ed514e5d04cb52e3ffad09b694f25f23f5317f08a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 10792 bytes
font_01_sfnt_off0000f63b.bin
17ea02a7cc03464f1791b16c6d225e461caee04ed1d88c8f94f3b90bf41a20d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 22004 bytes
font_02_sfnt_off00012eec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEC 16792 bytes