Malicious PDF — malware analysis report

Static analysis result for SHA-256 922dced31c6fc064…

MALICIOUS

PDF

110.7 KB Created: 2021-07-08 09:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6d25f17d18b760691fb664bead625ae8 SHA-1: dc9579f0ca1a608514e88acb0ab36a7f175ba94a SHA-256: 922dced31c6fc0646c001407e3510ab5d15d17d586b3ce21aafaa162617d9fbe
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The primary attack pattern involves exploiting user trust through a deceptive document to redirect them to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://synerhu.ru/uplcv?utm_term=everybody%27s+got+hungry+heart PDF link annotation
    • http://skisun.it/userfiles/files/dulumelatovujonabuvagixok.pdfIn PDF document text
    • https://marosme.ro/hirek/file/10062956239.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/datijomipapepig.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/tuxibiwux.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab390bc93a---52702909953.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/mupasuleruvewaba.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0689d021b---nuzugozifikajozaruzakumik.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3c0f7c9156d08fbf82df36a79e0b433b/talilup.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/tewamubujopadutul.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/lb3mom2k69jqkvdfduer22ejn9/kaketebopuwi.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f09c7de7d---38068342421.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58fae5e374---81602663879.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8400209555c2d443fdcd71d214d39faf/91982826746.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/r3irlhjadjim6k3s4fnigusnd4/89846849292.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/kelonubigola.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/nujipisifumamin.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/17431231442.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/93272249026.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/11euiglkgie1trkq9plmsbqg5s/5212145070.pdfIn PDF document text
    • http://asustainable.com/global/file/teletaforeba.pdfIn PDF document text
    • https://lasanisports.com/files/61828697492.pdfIn PDF document text
    • 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_off00014b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B78 19244 bytes
SHA-256: 38cc1be642578ed307851ec96720c846d5b8dda5033d66da56ebbffcfbaeb386
font_01_sfnt_off00017cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CEC 10828 bytes
SHA-256: 5c15a826cda6a4266613a2a5a73e09fecb1e550b375d47ba04e703eb70868248
font_02_sfnt_off000195b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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