Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cff2ca3796bd41…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 15:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63cafb4a683ee076334600c394680351 SHA-1: 161b82a28861d8e14b4a0b3e2296cdda505a69e8 SHA-256: 77cff2ca3796bd4140ef879d51bc2b1f69faad52b59d4f1dc918b6b6296fbdfe
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=far+cry+3+ps4+multiplayer PDF link annotation
    • https://autosaloncenter.com/uploads/file/35531473169.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/46231088362.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5cd03699---rijutu.pdfIn PDF document text
    • https://norservis.info/files/files/82773546860.pdfIn PDF document text
    • https://digireg.si/upload/32078057430.pdfIn PDF document text
    • https://senegal4d.com/contents/files/zuzuzegelitilumunekagutez.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/cl4lk835etgr0qsfmgcrq1tlno/befafekep.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/19036853292.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/13635315163.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/vinofemizamojemazaxozutir.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/36230005576.pdfIn PDF document text
    • https://majubesar.org/contents/files/tedozozekeratibubipatak.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210920083819.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/mipubojiwewekida.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/48556684532.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/66554209491.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/tavamudumifutigolunuxemu.pdfIn PDF document text
    • http://archbot.pl/files/file/91763838652.pdfIn PDF document text
    • http://parfumland.sk/upl/gabugemojuxunowomugedil.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/lavonerexinotovo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141710dca9c5---13248464721.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/jonenabebofadiduruvaw.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc2368f21c---pukixepe.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613E3DBB430B1.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/xefokolabonoveg.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_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 18884 bytes
SHA-256: b60ef2525e996fb088dbcf26a2275f0115872c78984238fb049e4dcf9a857205
font_01_sfnt_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 10752 bytes
SHA-256: 323d9c0bc0f09f96d452d51f3ef5dfb5096967f6cc536299addad61f579e90e6
font_02_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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