Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c13808a3fc9b10…

MALICIOUS

PDF

83.9 KB Created: 2021-07-06 12:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3abf4bb6ee27bf4736b0ed464559e3c SHA-1: 608ebc3cda1f6c618125c38f5a776b20e49131af SHA-256: 01c13808a3fc9b109284de1aba991b07669da5a886ebc9145ca3847901fadc3d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://zzarosiscarampola.it/file/52165649113.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d0fcacbb---54475303075.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a422c88711---sisojoxova.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609432692f865---90872990401.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ffb720d4e73055140f3e2ab0ac24fbf5/reninukup.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a77351f15cc---62255900348.pdf
    • https://cristalensi.com/public/File/3607030394.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/d9q1mddrs1uqcb51cfudtukraq/lodoteliboga.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/14138403667.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e27e2602---33698921442.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160797d380bd2f---63124971557.pdf
    • http://ty-universe.com/image/files/20210601_035841.pdf
    • http://lg-palette.com/upload/files/daxuxusozonegi.pdf
    • http://geoass.eu/userfiles/files/mexijofelapi.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac95884af---24751894940.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160758bba77096---nigepavedaxebebejivabeta.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/79e7a547d58e3c2d6d1714779bf1a207/30489639750.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607807f9e4b74---modevosenis.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/v1an3emrciamsfp73ld40k18n2/mijuginamizopepate.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/11078h5rb41ikcpiss8s7l8k4c/kavizexupujosowusef.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/tutogusutevelozikosibo.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d11830ffda979cb120ceeac574cea7fb/17934466902.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/n7thltl4567tnuajgbmhcv8tsd/wubutajaxaratotodem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=inflamed+throat+glands
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 16792 bytes
font_01_sfnt_off0000fedf.bin
24b1d0705cf98e787c2d5a6e067feb52d1dabb913ae2bf83b353db6c8e6d5df8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 10660 bytes
font_02_sfnt_off000116db.bin
9fced702f05f45477d7d568b7e285da23c9a9540c2959e4531ff50520dda8bb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 16716 bytes