Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fbcb060745836d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 07:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f41289abb4ee8a02debcb8f87831c3ff SHA-1: 4849be191ca7f43193f8f3fb4e432ed2a7864f1e SHA-256: 89fbcb060745836d586ae8504043f8c23b914bc21f52261aa2f8560cc84986e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=the+call+2020+online+movie PDF link annotation
    • http://devveb.net/userfiles/file/loxusofilom.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146204df36d0---30717057911.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/bidamatuwafaxuwezide.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/wawinabiwewoluzorak.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/aa30004a7407ed28692ac832fa7eeec7/59336291449.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ff9ba56232692acdebafd92cd28c942e/kekukebewuberepelozi.pdfIn PDF document text
    • https://vzglavniki.net/data/file/buzunekiraluwufej.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/39357267106.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/31832155209.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/lemisenip.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210906000201.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/64470454840.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc11c4413a---64008968372.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/guwekaveraroduwuwekekaf.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210904012138.pdfIn PDF document text
    • http://vpsystem.com/files/fck/75644137808.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/72730111529.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/60509776629.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/fotukodetujamajalazigivad.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee79eb882---8741713895.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133be05a4abe---1037906349.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xizefulev.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/45684472396.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_off0000b430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC42 16040 bytes
SHA-256: 9adc0755132f98a4e62b48865c974b97e4a5c76c14bea3a250694472fc015a9c
font_02_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 10400 bytes
SHA-256: 1afff915c3848efbf469fd3aaeedf1d5e44dda1240eb9ca369b50ef1017be7c6

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