Malicious PDF — malware analysis report

Static analysis result for SHA-256 7906e20e86256a02…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 23:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b44171aa179b87c43641127a06c69274 SHA-1: 57f5ef0b24463172afd2892a3648966af7ef4a51 SHA-256: 7906e20e86256a0232e78b45455ca8158f85b3c7897e23d9b6763a413e8c2235
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common screenshot lure technique, indicated by its image-heavy nature and minimal text, designed to trick users into clicking embedded links. Multiple heuristics confirm the presence of link farms pointing to potentially compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 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.
  • 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://svx.su/ffile/file/luvekag.pdf In PDF document text
    • https://resonanceacteurs.nl/userfiles/file/metobakibiluwadukuxag.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/vakimoruvozukekegofod.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rp95u4l88nvr0jcvcfvfpr9tpc/65304073568.pdfIn PDF document text
    • http://z500.si/files/pokudom.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/venudeluvopopum.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/66445786562.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46071160458.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/34077154051.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/naxorifamujaxugab.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/mokulefugosiperetudetemeb.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1200dadf822fb3bd0c355692abc466d4/bamikuxeluvakegizojujeb.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/tamulekotemudalitezu.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/69928973997.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/54592393045.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/30418367504.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/99843830262.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/5647863058.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614112cca53cc---13156383902.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc124ba71---40562650218.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/farukirabo.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/74450839020.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/ziwakudegorigu.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/kefipebiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+reboot+android+phone+in+safe+modePDF link annotation
    • 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_off0000af9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AD 14424 bytes
SHA-256: 813d2b391d371f9ea592a8e3721e2611f9237641bcb9ff0812db8108def4c14a
font_02_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 10936 bytes
SHA-256: a5e01d3b76000c2fe9a6f7f29c95095fee89855990f3900c06f5ef13f2431b21