Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec13cbd26cd639be…

MALICIOUS

PDF

113.1 KB Created: 2021-09-09 06:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ea0b10d7f120eacef3f44ca140b2471 SHA-1: c3cd98dcacaa8d99aef5ed92b2a1692b90fe9404 SHA-256: ec13cbd26cd639be3d9fb72b3d14bd15a21a985f6e175f97290bd4d0ce5c35e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hrampetraipavlavosstanovlenie.ru/content/images/user/file/88351716328.pdf In PDF document text
    • http://gyogytornasz.hu/editor_up/97307384932.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210908_D3E8A6CBC310E218.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/xazeparemel.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/6007492823.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/xobup.pdfIn PDF document text
    • https://12shio3.com/contents/files/lowajedonoberaz.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/jujivetekikixirej.pdfIn PDF document text
    • https://solturism.ro/images/file/wodagu.pdfIn PDF document text
    • https://gulamanis.com/contents/files/zeketovurokotalajixe.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/45883173415.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/360223738b59f25708dc9296309838cb/salogupigimufonizabasudu.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/43261917792.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/darekesijutakisoxuxaneli.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/16031907543.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/lelur.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ec39dfe8---fedixonet.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/77685263317.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/10269597303.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/foxikedal.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/viragezakolifupim.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/51ed121980dadd0c81ef305268f4ad05/wazagetoge.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/41530423321.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/53626190792.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315defb83c7---sikek.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/86614896233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=examples+of+collective+nouns+for+animalsPDF 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_off000152a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ABA 10892 bytes
SHA-256: 9f51b459e26d13c3c793a5b91f10e98d8f7264e2141d8a5e7b6f831ef95b6387
font_02_sfnt_off000183f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183F5 19240 bytes
SHA-256: 92f5ff5ea432cd56714acb824b6606715a8f790cabcf9f850beaae65c371d4b6

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