Malicious PDF — malware analysis report

Static analysis result for SHA-256 a202bbb45bb86787…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 17:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0c46fec12d5008037b6062615f71282 SHA-1: a07a7ccddbce5f97c6d2de6fe95e128a72202d0e SHA-256: a202bbb45bb867874c4ee5210b9734727c6fca5fb9370288581b65550a73f26e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Static analysis revealed numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is used to host and distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5fede82542c2655846ccf081c38fa253/kijefisopuposebijuwu.pdf
    • https://annjulieskarpmo.com/userfiles/file/1867775482.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160885c3461f2f---16792520501.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/nkb697kvjt4b6v8fcd5r49hfn1/luvapexiwozegitisifadom.pdf
    • https://digireg.se/upload/farumuburesojemegev.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/f0k4qcavtmpvhasb9dfuov70sl/24150539549.pdf
    • https://designclarf.it/file/bokudidovunomipazizelu.pdf
    • http://dissanna.com/temp/fckeditor/file/29433051183.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/povpe48glfn92e8dsr4rjlggtr/kenezup.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd27238941e---zuzefuwubixuzotajidifigo.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a8ceeadbd---3061441676.pdf
    • http://bjjiffy.com/upload/30329722361.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7e273f77df721ca9a6d06bc8a09e8924/80739014021.pdf
    • http://criollo-cocoa.com/userfiles/file/redip.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6c3558d26---96597544928.pdf
    • http://slsnn.ru/content/files/1676864276.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uukij7qgicstp8ff5bt56gdn43/daxiku.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72f2cb346---bojuduwerepinugiruwaf.pdf
    • https://bakwanudang.com/contents//files/56759711283.pdf
    • http://ncdesign.it/userfiles/files/65008824542.pdf
    • https://agentcctv.com/userfiles/file/ruxasifubumajuzadilofud.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099734076fc1---15223074396.pdf
    • https://tortugafilms.ca/adminfiles/file/47564547469.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcfce1948---4245316558.pdf
    • http://jnnycc.org/userfiles/file/gitevaw.pdf
    • http://www.predia.cz/userfiles/file/35903429985.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=first+ever+playboy
    • 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_off0000ef5c.bin
4c903537df2a2ef5c401e22906e0bae5da9d9528e769275431c57b0c51eaf91b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 10436 bytes
font_01_sfnt_off000106f0.bin
050616d6659c1b94e1b7e1b49ee354ef7e0677d81ae8bfd4c97fdf7e85a084df
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 17200 bytes
font_02_sfnt_off00013400.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13400 16792 bytes