Malicious PDF — malware analysis report

Static analysis result for SHA-256 02823c77b92608b9…

MALICIOUS

PDF

93.1 KB Created: 2021-06-27 18:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4092c28444438457e41adfff9c94e585 SHA-1: 0d2b64f577345a74231584cfd54d5a7cdb1605b4 SHA-256: 02823c77b92608b96ec92fab046e4eba2a3aaf8f7807756ead46c8baaec6be17
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no further context on its specific purpose beyond the detected link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160891710466f9---xerewuwuwijevexijuluk.pdf
    • http://daming-school.com/userfiles/file/90742306825.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607693087e065---30005025962.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3c1e1ca42bd768fdd065aef829be6d83/98822445461.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1436ebf316461bb3a82f8d323fb0c28c/79753271002.pdf
    • http://nail-free.com/ckfinder/userfiles/files/solojidorudiraropujuseto.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a334a8074d6---38032343060.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d8d601f5c55180590844666e02719668/80121344112.pdf
    • http://amphorabeautyclub.com/campannas/file/wozimotolawurupujamota.pdf
    • http://yule-sign.com/upload/editor/file/20210603034449.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a143ee4f27b---31772363376.pdf
    • https://obermeyer-modemarkt.de/upload/file/45866323561.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5714537210---5789628328.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608b17868aaf2---fewoxufavo.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073041a4d14d---45173105786.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/mitisebazemakewax.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608efed386dbb---20108698763.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf9e2bf07---vivosifomopawexifamesomo.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c249c18d78e25a407b51f36da8b01f7b/guzekaluvenosemewedo.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c5bc7e5d7b9a320c23c6a7ad19020a73/tefavekituxazisadamovuge.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/difizi.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4516923805b70cc8bff9531d38b14428/maramegazorodo.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce1a424a0---68527760128.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3bvaeptt76rcvv2q002i1acju4/nudajuji.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608b8d12e466d---ledupinefowakinar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=temperature+controlled+dc+fan+using+microcontroller+project+report
    • 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_off00010117.bin
cdff0be67a50079ec5b201fa05421e5b33dc1f2dfe2cde9f13df8089ef02efdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 19000 bytes
font_01_sfnt_off00013250.bin
07025926d87bfaa23242ad06543fa68942a809322db4652772877106394eca11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13250 11156 bytes
font_02_sfnt_off00014c1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1D 16792 bytes

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