Malicious PDF — malware analysis report

Static analysis result for SHA-256 44df8887d093fdd0…

MALICIOUS

PDF

97.2 KB Created: 2021-09-04 10:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a71dce306aaf8eacc9e2f7497484ec63 SHA-1: ab277cb5ae1a41ceffb25de0975fd629201dfe07 SHA-256: 44df8887d093fdd00d24d3ba48136dc21988427a0857431261f51cb36ccacdc8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern appears to be luring users through these links, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://wastran.ru/uplcv?utm_term=mudra+loan+documents+required+in+marathi+pdf PDF link annotation
    • http://orderbestwings.com/uploads/files/wanuzoveretijorabazo.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/15527574836.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/tedisozemovixuxove.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/venawikuf.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/vabodowamajikalabiza.pdfIn PDF document text
    • http://abwessex.com/uploads/files/gunusasowanib.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/95012528149.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b4a56c8b1---mimuren.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/zikokodibivaxumemifitevi.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/82096829520.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/22056922972.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/tegapetuzepakekikunipesa.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/9a84f447eb8029316995dab438d99eb8/9528744096.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/58411775712.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/vadidabakexikonomuveta.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/b13u82em3247th92cn9osd2e97/57054334931.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/23958ba4b67c8943144a4bd59c02f23b/16910693726.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/85797713809.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5ffc7345522c6b47b2a7e4af62041ccc/86531893813.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5dfb2hom3mrmhjue15gtee219/lefetitomuvududom.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/84856165586.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ce0ac98be3d630a5b1e4f911e4cb5a3b/goweva.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1rrk60ufjmpqpj8sp79po999a2/delotedavevizelatisonepap.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/93762937066.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_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 18924 bytes
SHA-256: e2a673051ae83fcbf89703d10c779a44673d3f3fcd5cd344e5adfbb81963151e
font_01_sfnt_off00014561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14561 11124 bytes
SHA-256: 9b52f198d2824a55b29af94735d77c09826624d5148a1f03f9e54bfd5720bbdd
font_02_sfnt_off00015ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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