Malicious PDF — malware analysis report

Static analysis result for SHA-256 09458a5c82d41269…

MALICIOUS

PDF

76.8 KB Created: 2021-09-06 18:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b297f845399a5791464be7e64ce58c1 SHA-1: 1a63d947d73b336e780614f778debb8ac696cf55 SHA-256: 09458a5c82d4126972f127a2262056b203487afc6ea9fcb780e35332604bbfb7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to various external sites. Several of these URLs point to compromised WordPress upload directories, indicating a potential distribution point for further malicious content. The presence of these links and the overall detection suggest the file is designed to lure users to malicious sites, likely for phishing or to download additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=enlever+filigrane+pdf+creator PDF link annotation
    • http://tiwtactic.com/userfiles/files/newamule.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/fusuwamorubikasevota.pdfIn PDF document text
    • http://nfc.soo.jp/file/6443882295.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/20160063358.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2b5a718d---30334936323.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/62804845217.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/91202085806.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/juzagomojazix.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/24498143298.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/tupekefudumomoximapax.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/50881853193.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16089e28e20e5b---zimir.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/0c2cd4bf19c1f82548861dcd24efe5e1/14342550797.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/zexokafefarak.pdfIn PDF document text
    • https://people11people.gr/uploads/File/53438986480.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/s1pe1v21os2lb1u7maj16eil4f/63327054734.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/lefujasozewefevif.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/49242488821.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/87031167370f8d697c3ce427c1a2adc0/98992393699.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/wevoxuxoko.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/s042g5ihgeh58a0nrnihpgnasv/24687662224.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/musekedodabadoferamerak.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_off0000c5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C6 10676 bytes
SHA-256: 2f577648b2d3821c6497c95980cb343ac1b0d1a7f8c2e94def1b9206a764f73f
font_01_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 18452 bytes
SHA-256: 1391a3cb99d804b1ad709509a8165f799813604226720a3e8e51ce16afc33192
font_02_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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