Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ff502286880031…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 12:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4603fe26efcc982a6dcaa48e5e07c7e SHA-1: 314f919c6c009f2fdacd187cef97e15af8e6a38c SHA-256: 95ff50228688003165a4333b23b3fc0f9a955fe701b09ef9bfdf037b09ecc314
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a high number of external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=21+bridges+torrent PDF link annotation
    • http://gymostrov.org/gymostrov/userfiles/file/35488332857.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/82158400285.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/kotelum.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///jewevuwuborabibamaxu.pdfIn PDF document text
    • http://edituj.cz/res/file/vemabomaben.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109021927547289.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0384b7144a0ba07c075326d0fb8df5e5/25266661463.pdfIn PDF document text
    • https://parfumzone.ro/files/file/mixatebara.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/98627908659.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210914173547.pdfIn PDF document text
    • https://renault-service.com/userfiles/71921637433.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/nupexute.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/77417533780.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sogebunorev.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4acb83e80d168c04ca22a5fec956be02/penuxijabelizobez.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8e9d46b6---98972033608.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/tunotadesozuverebaduzotu.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/jezobejizodape.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/nujivogomolibuguzobiv.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210916065501.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/bivabakovurorogovikagu.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/mezawixobitanotodiri.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/27746331075.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_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 10432 bytes
SHA-256: 3713f4ace9e4cc430b6f5ac4b4583f26faea92505de59e55c21705e86022603f
font_01_sfnt_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 16372 bytes
SHA-256: 055e94a0c1677dcca8182c2a0a40f62cfc8bac691d7fcf4cf41e2977aab82498

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