Malicious PDF — malware analysis report

Static analysis result for SHA-256 819b3e88c677518b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 14:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c61a1f5f431fb35bb016af79a586f0a4 SHA-1: 68daf321739a84dadd74e38bf25289d74e883bb5 SHA-256: 819b3e88c677518bf848795c688ec221654a62eebaacab4868dfbc200d180b04
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF sample was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and multiple links, some hosted on compromised WordPress upload directories, suggesting an attempt to trick users into downloading malicious files. The presence of a visual download button further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b925d825---gidipazipezogoz.pdf
    • http://e-sportis.com/images/upload/68974605978.pdf
    • http://garageanything.com/js/upload/files/xumeziwotibotetosogiz.pdf
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/pujematulomunarikimarezo.pdf
    • https://superpart.com/files/3985681771.pdf
    • http://diegogenna.it/userfiles/files/sazoriroxab.pdf
    • http://curvesncontours.com/userfiles/file/21168677436.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d412c0e14faf5d972aa6c5cf63ee3685/16225892170.pdf
    • https://livresdarts.com/ckfinder/userfiles/files/mefemakiw.pdf
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/59271447858.pdf
    • http://cnsgafgl.netsociality.com/upload/files/sezegabikit.pdf
    • http://waycreon.net/bhaskar/yii/upload/files/xijuretipotunovuvixokogi.pdf
    • http://veszpremkosar.hu/_user/file/8062263542.pdf
    • http://blow-w124.com/js/upload/files/gugutu.pdf
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/gamokawixejilaxurabaw.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134e713ed4e3---vokidugonibu.pdf
    • https://tnmkor.com/FileData/ckfinder/files/20210901_E852384688A34F9C.pdf
    • http://misbahelmudii.org/ckfinder/userfiles/files/zivuxamoke.pdf
    • http://mueblesdepladur.es/1/userfiles/file/47984210917.pdf
    • https://wisestudentz.com/userfiles/file/gopofagivukiv.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16136816ac012c---39713994059.pdf
    • http://rsentco.com/upload/file/nuperibolufog.pdf
    • https://habibitours.org/ckfinder/userfiles/files/30853414073.pdf
    • http://moiarchitekci.pl/pliki/file/bejavubujifefewifasajigud.pdf
    • http://a-swiss.com/upload/userfiles/file/52714894901.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sockshare+movies+download
    • 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_off0000e092.bin
b4701946b59b18e434c99f865c370cfe5685c5dab7b86b5520bc7b8f5710416e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 17792 bytes
font_01_sfnt_off00010dfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFE 16792 bytes
font_02_sfnt_off00012615.bin
e31f75a6b7c1a617d26f895f3084c8c1b621e8c621fc481759085a83d0fbd70b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 10856 bytes