Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a94834b2ba7cedd…

MALICIOUS

PDF

70.4 KB Created: 2021-09-02 00:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e911f7093f30544591b161d059032a9f SHA-1: 0febed465784f333f885de1838e8b1e722c31cc9 SHA-256: 6a94834b2ba7ceddc2bd387d0bb3c4ff09663550b82afab4e491fc2592a64f63
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to lure users into clicking malicious URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure, being image-heavy with a click-outward action, reinforces its role as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=360+seconds+to+minutes PDF link annotation
    • http://nw-line.ru/generic/uploaded/gofisod.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/71206544089.pdfIn PDF document text
    • http://waypl.pl/upload/File/riwoniligagibamexon.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ade8e330a4b---kigera.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79356479364.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a93a5c8cc76---sonafaxid.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/29812827833.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/gct8k79dn1ougiv6hpfkvsquhc/3521971865.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de8f9a2b08e---gakiba.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608871b9cc1d3---13162903046.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/lozopozonumopigusalok.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/004ee9e6cae8452740935077f22b0b13/33444469765.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/39077279615.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/tapaputowenufu.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/ludadez.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16115ccb20e2ca---bezelumovavotopuzojem.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3bf11e73---gerulalukujamoz.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/jopova.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f7561c3ae0f713cfe0f590a88e534d91/kefavovitigudemobijigo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/568ef969a3241c9960f549c6340a0f30/41047261582.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/13367306774.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/lefepimalukem.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6abeb3cff557524953b56bbddb043d34/97551047191.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/39291871284.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/vidujeburaxumuzedijeviwer.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/48128498384.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e958c74c9b84150103bd577ac7cb1938/jevijuvuju.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_off0000b778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB778 10688 bytes
SHA-256: e2357869fffbc84102a988bf387f7093e142bfeee688890efa6a06eeb3e3507b
font_01_sfnt_off0000d001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 14064 bytes
SHA-256: c893bf3a0ae0ea92d451d9a9af081001af1965ced8d7a7f2a2ea4eec39af1271

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