Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b457cf7aab42ec…

MALICIOUS

PDF

92.1 KB Created: 2021-08-23 17:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e16dd13ec1b2a253c33d8dd293d36fa SHA-1: 493275b4285b623019c45194d99f68a4f6e23dfc SHA-256: 06b457cf7aab42ec94d20fab8e9e8e6dbf4bdad0004420967d393d4c64db8c69
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://medvor.ru/uplcv?utm_term=kristoffer+polaha+and+jill+wagner PDF link annotation
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c765533dcc---63574359138.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/67939805610.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/71170556823.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/69890957710.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/28786724059.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/779g2s67let7sp5k5ihhqn1cap/wonisamevuvurix.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/suxaronugewuzotolu.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/19082465125.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/79815319677.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/vidajugusutuz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607254a00ad20---mibonefonipimifoge.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a68344a79d7---31803694479.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/likudafedupekewuw.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/ramevegavof.pdfIn PDF document text
    • http://palami.by/images/file/madarafimapo.pdfIn PDF document text
    • http://mega.kz/media/upload/files/88002346939.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/54356360683.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/7963754827.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/netimulofeja.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/92292177614.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/95523950555.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/905d25fb2174dd733e9e40f65fc1985b/89759340651.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/limitakaw.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/85240262430.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f32ba68782f---62063026176.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_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 17532 bytes
SHA-256: bb5464348bb601b4b5d3d81d72a2633ae9f6f7fe6584afee368ee72985c8f11e
font_01_sfnt_off00013078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001488f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488F 10984 bytes
SHA-256: 6398c71d4f42fbf6c64d4fbffe2c9d4964044ae72c57b2d2588eeb60b74d3fdf

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