Malicious PDF — malware analysis report

Static analysis result for SHA-256 999328b9b278b150…

MALICIOUS

PDF

85.8 KB Created: 2021-07-06 13:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c38d7657b16eb3e665cdd2d5f824e30b SHA-1: 2ac3118a891529c3d7b8f2464dbd99bf1cb6f059 SHA-256: 999328b9b278b150642d7eac7ff1b37a3eb129a4ea2b4a515022b6fedf537792
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=2009+mustang+gt+for+sale
    • https://hchoanglong.vn/userfiles/file/93381386559.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/2eefd3ffd146be36b2b19400e2d4a17f/88409140387.pdf
    • http://atthaya.com/file_media/file_image/file/8438067677.pdf
    • https://marljivo.hr/userfiles/file/gosuzavo.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/678632818ffc2dc8c4fac7b680d43ef3/13932780525.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/p30o77qcblvfgor47li2hr2fj7/bigisovuwurozuvu.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ba62360beaf0a60558f637e3d37b99a0/muzekufasusimi.pdf
    • http://starke.ca/clients/84205/File/79977677863.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/539754fb13226edc9be7e33e8ab0e3d8/sapelimixupibex.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb2a6d049---51200750243.pdf
    • http://hzzxtl.com/UploadFile/file/20210703225421751.pdf
    • http://coimbrasoftware.hu/images/uploads/files/67966081215.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d58a38c3a86eaf5d2639b4292e3d9a9f/98677628456.pdf
    • http://decamiones.com/userfiles/file/lilijenadakafusigajexiwer.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/dujesagegudopalixa.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce452c0019e---seneboxajalukot.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608132feb2734---xuxapem.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/4vr3snmvh368j15rs8p4b3jqv0/30120650610.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/236e5e8d97dcfeee3bb5556bd1441e0f/xulobu.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/d9bfea6ad53787f0e2416f1a34f2f2db/tojavi.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b78b83121f954d4a8d5b8d19f0ee7a3/16016863292.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d822e4a8d3ee97df83b54537a7ff8706/xopufak.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54c6953c65---pufewomevugugalebelafuxe.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_off0000e92e.bin
759de64c58b6473e194ce4780ab8df3b9b119f6aa42dbf1186740f7ac28af78f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 18136 bytes
font_01_sfnt_off000119b8.bin
90ab995bf477cedf73305aae83f65f3cf667800759d23a9ba763d08e20fc8ea4
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B8 10876 bytes
font_02_sfnt_off000132f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F3 16792 bytes