Malicious PDF — malware analysis report

Static analysis result for SHA-256 8020e43703fcd002…

MALICIOUS

PDF

69.0 KB Created: 2021-09-15 20:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efec0541a202b6d200a96fe33d3493b7 SHA-1: 27b8b55d1b1facda4848f4da19184a51f4b9612a SHA-256: 8020e43703fcd002e59fab168600f7625258a8dc260bbca8b2e77c4bfcef20aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript, while not directly executed in this static analysis, is a common technique for obfuscating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=pc+download+for+android
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/47093078935.pdf
    • https://krantiservice.com/ckfinder/userfiles/files/midaloxet.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22114285726.pdf
    • http://royalleasingny.com/admin/images/file/7890757333.pdf
    • https://mehreganimaging.com/images/upload/files/xopoxavene.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/da3ccecd60c8e1b826085432bddcfd90/sofoxiwufaso.pdf
    • https://apotekatia.ba/fajlovi/ninezupekul.pdf
    • http://sampoernastrategic.com/uploads/image/files/tamifedugete.pdf
    • http://pdww.ru/ckfinder/userfiles/files/28713745544.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/a5hn50pjbod5kugkdbokjoitv1/fiwofoxegibuvati.pdf
    • https://sieuviet.net/webroot/img/files/dogogufapawadafodizimalor.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c83cfae047---47760381744.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/48831c098fc3cb7412bcaf60ada6a9e0/tojuzu.pdf
    • http://naviway.su/upload/files/58740354827.pdf
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/45837935053.pdf
    • http://xsjsbzrw.com/uploads/files/ruvujugize.pdf
    • http://ingfrimale.com/userfiles/files/17718972641.pdf
    • https://butagallery.com/userfiles/files/54204274943.pdf
    • http://csc0451.com/userfiles/file/20210911025944_vhuknj.pdf
    • https://atputasbazes.lv/images/userfiles/files/69682139294.pdf
    • http://thewellmanteam.com/userfiles/files/buzotuzafojosadovi.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cb8e6615c6b7441ff58b2543977328de/rabuwarosapikivevuz.pdf
    • https://amursvoidom.ru/media/files/pogibotivot.pdf
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/wenakanilebekopo.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_off0000b2c8.bin
552961d042e205b5cfd67c897b8f5b344cca9da3b769d7f98dc8ed10779e0641
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C8 14464 bytes
font_01_sfnt_off0000d742.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 16792 bytes
font_02_sfnt_off0000ef59.bin
333e949f903f79b0a807116897623e24dffec714c65c2b217ebf32b4e89c1e57
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 10156 bytes