Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacd657caadced16…

MALICIOUS

PDF

88.5 KB Created: 2021-07-04 06:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1717a6b6a1cdfb42563db36b99a97727 SHA-1: b5a9fa393e2a4d4d502849241095e207874a816e SHA-256: eacd657caadced16c3aea95f0bcd499c265170853d9fdb03ed69ef415c35798b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c467ed30e86---worumimef.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b059151c6d5---sadufixojeliwevepegu.pdf
    • http://au-zlato.sk/upload/files/liriturojiligaroxojavat.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/jgmqfsss8055an91fo8dr94e1h/2800777180.pdf
    • https://anmoul.com/userfiles/file/bibeditasuvurogevazimubi.pdf
    • http://digemnd.com/UserFiles/file/xonak.pdf
    • https://ltssinternational.com/res/wysiwyg/file/59495832667.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/h93opii0709d7c3rh2tfb252qq/72869764800.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac91a5a48---vosakasexakifetomesafofij.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e7a885a974406856cf17a4adcafae3fc/fetukekidadu.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f411b01da4---23566143417.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/141b54eecc754912906a0b820aa301ff/40820654307.pdf
    • http://asijskepotraviny.cz/files/file/gowetatu.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/8c01a9fbbc406b257c584ba729184d5b/6467810099.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925a9b925f1---tebapuvefuse.pdf
    • http://minerva-collection.net/files/files/nilisim.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5f6de86bb---molil.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850a98ba868---44841419720.pdf
    • http://palami.by/images/file/debevijigixatatepipimazex.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16077b69fb0849---pobeb.pdf
    • https://psychologgia.pl/Upload/file/lamixupopura.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ab5f7efc5---vizofediwunefid.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/mowiveborofubox.pdf
    • http://consulcongress.it/uploads/assets/file/wusavaresunuravix.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/34cdd9d9d8d93507745474b46d90cf64/nedudo.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bec324741---37137618803.pdf
    • http://robertoantoniz.com/resources/original/file/migijimok.pdf
    • https://canevastoilestjean.com/upload/editor/file/32909536319.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=blue+ridge+mountains+rv+campgrounds
    • 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_off0000f4e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 16792 bytes
font_01_sfnt_off00010cf7.bin
8097c9e4b7de7885ab89ed8a8e056dbd9aa80282641bb4c51aeb929a0032aadb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 11076 bytes
font_02_sfnt_off0001269d.bin
789c0f85a455216f5cb5a82e42392ec113cd4c13c13db9ee7a3a73c7f443f98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1269D 17396 bytes

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