Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3e0cc5741436bc…

MALICIOUS

PDF

130.1 KB Created: 2021-08-03 00:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42754265e055b96d09f2045a0aa59b40 SHA-1: 28084e6826cb70ea54e3f81b8cf83fb13db60a32 SHA-256: 7a3e0cc5741436bc6b1255578456e25d39c152d17629593b044bd6687d94703f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://ketchas.ru/uplcv?utm_term=what+do+risk-benefit+analysis+mean
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f237de501ca45462351bb06a9c2e15a5/dibinimeneg.pdf
    • https://phuquiland.com/upload/files/zafedimopujinutululoliju.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c2c547b3f---13356078109.pdf
    • https://studiorampinelli.com/file/45617352790.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/bc2e466b4j23inb3kv9e74dpa4/1438684424.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4576acdba9---321880782.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865dbf24d93---xosus.pdf
    • https://noithathoaphat11.com/upload/files/97817782829.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebe5a08d4---gitixeso.pdf
    • http://okfilm.kr/userData/board/file/kuruzodopapubaminupu.pdf
    • http://studiodugnani.it/userfiles/files/1615911963.pdf
    • https://imagebeaute.fr/userfiles/file/wagizumasebag.pdf
    • http://kxzyjy.com/CKEdit/upload/files/91808179303.pdf
    • http://maihome.hu/admin1/file/18336805276.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1e8302e0c---metajogebenu.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d112ac97e---durodanewot.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd88b5627---28613344706.pdf
    • http://muszempilla.com/files/file/fofexatutevipaz.pdf
    • https://healthmatters.me/userfiles/file/demajajasosuv.pdf
    • https://atlaskvartir.ua/data/uploads/files/81875221912.pdf
    • http://slsnn.ru/content/file/xugejusa.pdf
    • http://annandale1963.com/clients/69704/File/90145938070.pdf
    • https://martensmgt.com/business_school/uploads/file/15289933089.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d0de1ce31caa97b5e962da639932d6ab/kizigenogijajepuj.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cfd34ff03---73775009197.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c983ff16cb2245666fe14551fd381577/xilaletibapovujurejax.pdf
    • 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_off00019871.bin
b3e79900c8a597de87ed841762f4a20c90b3f69bb2bad214c67c292c6b16dcaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x19871 10992 bytes
font_01_sfnt_off0001b1d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1D9 16792 bytes
font_02_sfnt_off0001c9eb.bin
ac83f1d3ef605662cadb2485f5ecde9c369b49d4bde398f0df5f484235c9e99e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9EB 18748 bytes