Malicious PDF — malware analysis report

Static analysis result for SHA-256 3773c1a2189dc7ac…

MALICIOUS

PDF

86.8 KB Created: 2021-09-15 15:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03fe906f2cf70b1a9273098cd8182633 SHA-1: 1f16738f7538c9e28bda8577d38ec19ef08eaa07 SHA-256: 3773c1a2189dc7ac4db936ea67d0f043f024b65caa61badb891a6631bbb9e387
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and the overall structure suggest an attempt to trick users into visiting potentially harmful sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=prime+tv+mytv PDF link annotation
    • https://b2b-intelligence.it/uploads/file/tuwomori.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/23727916073.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/desegopufutu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff175c789f---javizapatalisidisikifawi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca793b64e2---vunarogidigagip.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/65143880248.pdfIn PDF document text
    • http://adice-area.com/pictures/files/43194162519.pdfIn PDF document text
    • http://giga.sk/storage/file/17995110278.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ahn48icintvpcvpvsjnr64eotj/nobedafexopatotifo.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/44132594258.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/dolexuxogerimefaxo.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/27673433852.pdfIn PDF document text
    • http://ned.ru/uploads/files/zopigewurunenav.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef881c89d9---10749351215.pdfIn PDF document text
    • http://cortabellanews.com/userimages/gejudul.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/29154284943.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/pabiforivazoz.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/18037773805.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/mutelusawunenunaxasedip.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/87522281574.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/42025375407.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/kedik.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/zulazexizotekinov.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/fojenasotipotoxif.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/ronugipupofutuxiv.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_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 9852 bytes
SHA-256: 302826aa611b56d5afa30338c657cac7c6548d5efee7e42f9465f5eb4d0d67df
font_01_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 18440 bytes
SHA-256: 67e7d5c333e3e3479b8f7d4390406a6025f8eee52b653792ba6b966d6587a665

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