Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c17023c65fa849…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 20:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d85aacc10cb186e8e974ca324d6e149 SHA-1: 523158d0d1e0a77706d5ce2c0842167f4ea73d31 SHA-256: b2c17023c65fa849ead913c4f100718f69adc48a439ff475340ae1aade2fff12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content.

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://crysiq.ru/uplcv?utm_term=vola+sports+live+app PDF link annotation
    • http://cozycornerexpress.com/uploads/files/85102296689.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/29551610105.pdfIn PDF document text
    • http://starma.pl/files/file/rigero.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/84264239175.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/dodigitapasosudepukok.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/mosederajokuraz.pdfIn PDF document text
    • http://eventechsite.com/files/files/18012331580.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ac0e00071787872a3fffa70cdec7bf02/jezenef.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/80140898663.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/92715169249.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/mubozujibu.pdfIn PDF document text
    • https://upaspor.com/resimler/files/84506246020.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/72636958729.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161408c38c48e1---jopako.pdfIn PDF document text
    • http://www.centralperdana.com/file/lunuperokuvof.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/wanobosome.pdfIn PDF document text
    • https://adium.ru/userfiles/file/lakurakomaserimanarog.pdfIn PDF document text
    • http://montesantangelo.it/files/files/jaresosezizus.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a5ca01d245c3f59f724023aed9a062df/kobik.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/170064109.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/zirakep.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/jibosemipenevula.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/nirutarewa.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/75f044af1e98245e57c1076591507637/gujukuverilakadub.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/suwekoxom.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_off0000e14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 10176 bytes
SHA-256: c200c4e4e50d52f2492445f44536e1d1e2321455b90a95878f13e9c8a98f9e3c
font_01_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11054 17840 bytes
SHA-256: 676946f3766e324e94949d756041d1b1ff41abee0e4b0a74dd4e02ffb65cec96

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