Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4222afb998650f…

MALICIOUS

PDF

85.0 KB Created: 2021-07-17 04:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c2bdf4d7a348a2863a2eb4eb6efe5dc SHA-1: 7d8c1581d3a4a611850420bc69fb99df3f71ae8c SHA-256: df4222afb998650f9a32668fdce1295724b3793da0d55102b2d8f344a2a20e40
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of numerous external links, many hosted on compromised sites, strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3a2d974c---xaxukavafinadoredemomeg.pdf In PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/13301304011.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1f776fb9---nunegobibidokopisawim.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/73240573944.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/78422640691.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/xiwexojabidosoxodajuwuf.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc72dab3a7---80096535438.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/eeec3fd55c079dc5fc02725fa28f934d/ruxodamovewevidum.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/lejaribijitovonul.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/vogepuwufeku.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/55267850657.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/78003fb78d038f1254d659f3b551a565/vosuxo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cde9216418---tobamibitatudazutuzasukog.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/pigotulunazetikaleki.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/kipuvemuxileb.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607508931838e---mimozugader.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/mulotuxuxepogatuwuxikepa.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac87f72b76---jibevinimuligexutagaje.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac353dbb072---gokanikiwufotovavosisol.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b9c83e789---refesimanusijeb.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/5249936647.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/ziledurinusijawezal.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e46780544780d30c75c893179b45852/62115397232.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caeb7cf22e---36555020454.pdfIn PDF document text
    • http://candientushinko.com/images/file/sisuwosepadabipi.pdfIn PDF document text
    • http://jarosi.hu/files/file/82190240451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+red+rose+and+the+nightingalePDF 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_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 16280 bytes
SHA-256: 7c0c3bc5ee82683209cfd4ca79de1c2eb8f872dcc6e7f8d9f1536611f6829d18
font_01_sfnt_off000116f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 10488 bytes
SHA-256: bfdc8d3c946eddb4b893e4832259b8358419558187ed4bafe924251a5a9d2809
font_02_sfnt_off00012e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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