Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06b92d8ac8b8506…

MALICIOUS

PDF

110.2 KB Created: 2021-07-19 02:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f70a3ae7d80aecb4d9ba8c6310de4d5 SHA-1: 6057cda41a4e2a196ed520d1b3e923a3a33bf4dd SHA-256: d06b92d8ac8b8506ccb8a19b5e2a7048c76d9a73715d77c2cf126b960a087f22
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS uploads or disposable hosting. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 http://ajivikafinance.com/userfiles/file/wepizegibubez.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609786f56221f---rufibopa.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/33023737040.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/58993805623.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/xuxesubikitejov.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab99052af6---13811576747.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/viruzijarawosunipuvijog.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/89c70a75de8b644a41374511bd306473/korefefuvoruxemivikero.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rfojl5glrsuo07rcqj5ddcugu7/perewunibegav.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48a57f836---rakuxizer.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/lodoxanakuvekupijewekoj.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/717cbc20b4bf3d0c1ee5fe0193fff42b/nuxedugufebexek.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/4a1baf001a0d3fd3c0a6b6a44dc99fb8/43885465474.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210621225911.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/23571015299.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/gumoraledonofogavu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0c053ee585beb9d36a6bcdbf2eeb9be1/sezoxijusifurokigare.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/i4jp20halg134uf1sht26q48b5/50083316999.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6q0l97kg3nt696ocb70snar0i0/63667362597.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1f72e60c---7388745530.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160726c93449b6---pelegewejotatiwife.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/51288fd9abbbde1fdc85ecd74c48d80c/kopimarew.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/gabibetinopobewekinozata.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/30707249897.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b15e7f373---fulibikamenimivijaguliva.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/63582851787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gesture+meaning+in+tamilPDF link annotation
    • 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_off00015142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15142 10472 bytes
SHA-256: 00acd63442df496400b71d154a2b1feb1a79c9c24524a2efea414dcc4114c1d4
font_01_sfnt_off00016906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16906 16416 bytes
SHA-256: 019d10da45dd54ef058389ce48c80952960eb1609cb69749d2529bdc13351f56
font_02_sfnt_off00019381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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