Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9f982cbcafdaee…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 13:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c026fe787a90c3970315345fcfbd3e4 SHA-1: 03075bffc3c6a972593c0ef8b153726675890993 SHA-256: 7f9f982cbcafdaeed5a7e984437f32294d3d104aa838c5cc8f4cddff246b4e9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The presence of these links suggests the document's primary purpose is to lure users into clicking them, likely leading to phishing pages or further malware downloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=principios+de+pascal+pdf PDF link annotation
    • http://sitoad.com/bbqjoekey/files/202109011112148112.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/25970489895.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/9618572085.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/79791243522.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/wozonemenejotijediwixazo.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/miwumiv.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///67329268174.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/bozujeni.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/83379879622.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/74070880183.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29340d928---lotaj.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/ritadevumemutodexanupabok.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/mawazizedegonosub.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/fidefanujorabukave.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/pugovewowufevexazexelato.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/pepolijewugef.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/83005367851.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/kopomekeluliji.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/58280210170.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/tojuxibitafenosaninesi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133daf8b114e---82595764119.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/jujagokokovafoloruposasa.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/99266730889.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/2ed4c00c161a4565b81fcf4c13b11b96/kopexewojisaforikunipag.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_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 10516 bytes
SHA-256: e9d93592af327bb7c42d110a8a145e8c1d78ec3502fcefdfec894294e333dcf4
font_01_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 21340 bytes
SHA-256: 136ab76f37fe6bc24df94d2fde4baac99c384c735b393dd98e38334b369e1794
font_02_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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