Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4610826b8ffd190…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 12:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 320cacb329f61635fe6474a92004acda SHA-1: 05080bdacfced5bbf9585a936b33025eff130faa SHA-256: a4610826b8ffd190ee09011513dff2ac2aea6db3f9f543b5622b67564a154df7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gocep.org/data/userfiles/files/96216785007.pdf In PDF document text
    • https://aarhuskortet.dk/images/file/vamelimozetemejewefiluxeb.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939145feb4---93201061475.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/xugorinegoxif.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae9bb4d28---xetegejonabogironuxok.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/zosagujipibinulinorope.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kamexurowe.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/65910499071.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/xorapori.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/45a13e2a0aec68090a382af22cac9b53/5461094512.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/jefodagoki.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/64640117526.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/32078238262.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/4463649540.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/80680584424.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/26594530125.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0dcf51d0f---31041297851.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/benopigolugerezonukuwu.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qkqj739rdj563kjhq5in3p4hfo/11953044511.pdfIn PDF document text
    • http://zae.me/datafiles/file/37326537322.pdfIn PDF document text
    • https://grnca.org/img/files/files/93468753622.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/jekatorufulelotisu.pdfIn PDF document text
    • http://lg-palette.com/upload/files/rabugenefunatogu.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/nuvunolulokefarakeboko.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/23386824814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=super+call+recorder+pro+apkPDF 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_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 21328 bytes
SHA-256: 199545b375012d757a51cb178ba1224ee6bca076274f2302e7f210f6c392515c
font_02_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 10312 bytes
SHA-256: f2489e8356a02e515cc82ca191d82304a73c674865bca91904366c5bc5c2114c