Malicious PDF — malware analysis report

Static analysis result for SHA-256 b082cbe38fc05ee0…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 13:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2850a9dcdc5b3c31e42f44ee61a4af35 SHA-1: f16c9c416d5ddeeedcc828fe96c1ccbb68d6ea03 SHA-256: b082cbe38fc05ee0cd15b5c2483cfbb7609e809d230d7cb33a5ba0b3c728b992
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, with a high ML score and ClamAV detection confirming malicious intent. The presence of 'utm_term' parameters suggests a phishing or spam campaign aiming to lure users with promises of hidden apps or other deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=call+recorder+hidden+app+android PDF link annotation
    • https://godahoian.com/app/webroot/upload/files/vokidorijasiz.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/41320297853.pdfIn PDF document text
    • http://ossokahve.com/upload/file/60138281100.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/sifirired.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/2147927337.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/34752192747.pdfIn PDF document text
    • http://tlznailspa.com/media/files/92562228045.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/38933286274.pdfIn PDF document text
    • http://sbcnepal.com/images/file/71927891778.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/97278713907.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/40564448389.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b23b239414a58068540c001936b05088/44431065997.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/393b3809a4e0a0bdc085cd4e5b107342/tigawove.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16131907b32ef7---toladuxavevamijebowuv.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/97271996898.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/89923022310.pdfIn PDF document text
    • http://cecev.com/stockages/files/kipimulexopebawozumaj.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/15480102271.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/wagadatamuku.pdfIn PDF document text
    • https://kimcert.org/E/file/jamabumabawufexutiwe.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/15000978416.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/11887844779.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/47632687158.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/51272037424.pdfIn PDF document text
    • http://maidichike.com/upload/files/pekaxutigejifulepeginefow.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_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 18636 bytes
SHA-256: 3ee937cf7675e62dd2d55c8666a779d5d0d8dd614752a82bab7284b014ef3b90
font_01_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 10376 bytes
SHA-256: 2aee67cd3ee9f3f2c752da371bf5d253118c9e98c0a8784c8a11800b305b6115
font_02_sfnt_off000133d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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