Malicious PDF — malware analysis report

Static analysis result for SHA-256 24779d90afff5c78…

MALICIOUS

PDF

81.7 KB Created: 2021-06-27 16:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f122babfbacb0ff1c4ca1ea9d79f5b69 SHA-1: a7a6b389deb116a983182a6c4a367fd69833c92d SHA-256: 24779d90afff5c78995e7b1cd98d1bc950755c729fe57f489328eb1f1271aae7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pistant.ru/uplcv?utm_term=segments+rays+parallel+lines+and+planes
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e1211053e215d0f1e44e1f096628e2d5/sajotun.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/tokezirami.pdf
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/56507387146.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160973a209d0ac---79110793951.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7163839f3---xevazejojaf.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af5c87b49a---vinopiguxedol.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/19f2c44c5808b8d2e7b0ae0ba2aa34ed/23624344157.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16089c6c00a478---xejasa.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/dokerinatebewomurubone.pdf
    • http://christschoolblr.in/userfiles/file/sexunawejazo.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280c20e7a9---tuvogokupasufonojik.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ecc5ecca---gexulusexa.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160864521b8edb---kutasarigoxesirojowe.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/069f9496d4bc4165af086529b1775b22/33953634622.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d17376cc4---91771508125.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/t4n3t3eapfjm04q9u0k5s5m2q1/nimunafigoxo.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d475de34a82a933fd3ba331e068bd3c4/62056339657.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd4255cf6---70200988306.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609269629b660---mugubodezub.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e237a4a2ed---zokenazutoponutir.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cb907fa103c---zegifofamopanibutuxi.pdf
    • http://3qlohas.com/CKEdit/upload/files/laripelisewukunovit.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/25430884359.pdf
    • http://vds-construct.pl/userfiles/file/xemopupizegekofuvunufes.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/0jn94frfhvt04gq2dhbnkk1r21/gamodudotepeb.pdf
    • https://hanahana.vn/media/ftp/file/gadolusifunetezoteke.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb57e3c7a1---46672220821.pdf
    • 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_off0000db5c.bin
500c16cdd88b7201575fb4e80b82cf310cab33ef815d7c8b69dd3ef7d6bd9771		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 10804 bytes
font_01_sfnt_off0000f3fe.bin
c9c6866fa31d47076905fa31fa159a56ecf92dac2484f50574421d121dc91348		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 17296 bytes
font_02_sfnt_off0001214a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 16792 bytes

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