Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c9102d87df3cc2…

MALICIOUS

PDF

90.3 KB Created: 2021-07-01 15:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 490aefef2a3d14c71968781ea2362bbf SHA-1: 87910c9890b3ba2879de9ea3f49c153091085b01 SHA-256: d2c9102d87df3cc26b5e19b2696949d7a895eaead9bd7ac186909c5a21d94c17
164 Risk Score

Malware Insights

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72c790745---45284669891.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc3cec770---94239037612.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hc09qbn9ggvv2h17barle80sv1/wezitimemigirepi.pdf
    • http://bpabv.nl/uploadfiles/file/77774124647.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084177e38fc4---99995778851.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e8d551281---kagagep.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/96102364707.pdf
    • https://airtelco.com/data/users/_/email/files/26408064870.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/abed0b94bc3c82c81dab0514b021a168/xadovo.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/1e0ba6579922992ed29486c832dd6388/rubetenusiwe.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607221de1df74---40059144552.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160784dbde87f0---61177609412.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/pd7pr5b035p83vdefo7kr0ib47/vekipelavu.pdf
    • https://bravo-hk.com/userfiles/file/xuvebofesuwexojufidagud.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/9c8440609face8abb0bdfaa8e4fcf746/fuduxotifemuromikunotalax.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/3c4c134637929619b16e7a03797bc2fc/lonuretaz.pdf
    • http://shipagents.nl/uploadfiles/file/feputulizul.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b267ab7e7---83010393591.pdf
    • http://ezibra.pl/upload//file/xexilapidatorene.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7e4acbd4f51e16c7d29dcbba250623ab/33713402854.pdf
    • http://tfforming.ru/d/files/32959821558.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc1eb6c0d---wolavosagotari.pdf
    • https://5udua.com/contents//files/54371474873.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/42f73520988ce92e6859150d64e896d9/2844595609.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210616_70265EFFC545B072.pdf
    • http://luingpyrex.cz/foto/Image/file/dumojinatanadatij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=moto+g6+play+android+10+update
    • 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_off0000f7a5.bin
d2194a8c82b47fe5ab3ea9412678bf7ed49bd48548f511a14323b1936cf8a867		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 10948 bytes
font_01_sfnt_off0001110a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 16792 bytes
font_02_sfnt_off0001291c.bin
e0a9be3664044f636fc65fb94aff6e6e3f3734482cb96cc057c46dc051c44192		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 19872 bytes

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