Malicious PDF — malware analysis report

Static analysis result for SHA-256 334920b92cfb86a0…

MALICIOUS

PDF

76.3 KB Created: 2021-07-03 00:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9fca0071df9d160f1975e4195c44b358 SHA-1: 872603664826d747f7f2753628b7094c70bf85b1 SHA-256: 334920b92cfb86a0b418c7e7f2f750eb96c1ccc120bb27434f4a1b2f8bbe6c82
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://nikoljski.com/ckfinder/userfiles/files/29792829076.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af2701f4ba---dateditiminenefuw.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082129165daa---fubitikukoreb.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8ee1bc198e02228492e6901850b3d8f8/kunefulafekafud.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/82645031038.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/kunevirizorav.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/julekusoduvoro.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/41ec6fd217f6b9a4528078617f0a5183/74830059594.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8cu1hs6q3kjhtqcfgk10ssn376/83537793816.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/9199555473.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/ea9805d9824213dc20962c3d76c563e1/35149367640.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/febofawilelovurupago.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/7893995637.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/quoqp4gl2gl0mvgj0ggs13bq8c/tonokurorelokididudi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbecb83d2cd---50981877685.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/tononewaniwunatijegede.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8d1cb1b1---7162192137.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/21308448433.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/pibamufiwax.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/81743648352.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f7cfaac1791ba7e0e69a2fe5f189fe1c/kileritumamega.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/49375664520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=percy+jackson+and+the+lightning+thief+book+downloadPDF 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_off0000c2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CE 11320 bytes
SHA-256: ded616423f74c1575e74ebee6f6c2f950e845acc1c20548c5a8a88ecc2d020db
font_01_sfnt_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 16884 bytes
SHA-256: a81d11cf661ef1c1b7bb659902d08497236d8da9f22dfd967f46a32ee57bfbbf

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