Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bae3a9d17a21637…

MALICIOUS

PDF

90.1 KB Created: 2021-07-02 12:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9e50b865e36a49084a9a26a8f33d892 SHA-1: 67a8d34b1cc2c8371af354cd60050046bef57f70 SHA-256: 4bae3a9d17a21637f14d20b16993c1d7addc20b5f9280600f0a763ff8f78785d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure itself is designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cybernet.asia/UserFiles/File/towof.pdf
    • https://pet-fashion.ro/mm/file/ganuvikone.pdf
    • http://mariopresto.pl/userfiles/file/saruxul.pdf
    • http://mini-garden.ru/userfiles/file/gisodovix.pdf
    • https://edbcagliari.it/file/midobusodeloluliror.pdf
    • http://aisef.org/uploads/userfiles/file/file/duvonolisopogi.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b9d3cccbaaf97ba7f638c6ba24ea0b6f/muzavegaw.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/irr2e39aegapt28itl4d7fs9lp/jifatovufoket.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/729ce84743b203f2f9897e0faedb7469/76296776768.pdf
    • http://wellfoto.cz/pictures/files/makamizojizeri.pdf
    • http://apcmagon.com/userfiles/82163174918.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2837ae6fd---zojoxe.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e782983516---nogakanulixajiwibe.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/b0p8vafbja13g2ptdtv54rccf5/noneni.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f70ada9642e5942c8d48043d72a58db6/32440540752.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160839bf2aee3b---bajesuf.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5l23d8inbq6c568b8s8c5804j7/99633757190.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c654553d0d8---lidup.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7427019e9d---72270491217.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f106ebe0322dbf21d5dd12c3a06876db/83732234608.pdf
    • http://ronaldtan.nl/images/photo/pofulaxajigejef.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2hf8ievsak2119ngpmovrarg40/xoxokob.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad265240e9---xapenamowipuv.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-7-2/20210702022456496631.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=muscular+injection+sites
    • 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_off0001008c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 16792 bytes
font_01_sfnt_off000118a3.bin
b3118a61ad655b6624d1783271def7962b0202572fa77040007c82edad6a581c
pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 10444 bytes
font_02_sfnt_off0001306f.bin
8d8877d6fe1a13ff86e3c893fd439451a355dd5265951e5930badce0573d123a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 16484 bytes