Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc435cdec02eab03…

MALICIOUS

PDF

83.4 KB Created: 2021-07-04 01:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a7cd215da85c60b766415f438c2ad66 SHA-1: 74b7a1d6b4ebe2b586e807e88f8a17795004e6c4 SHA-256: fc435cdec02eab03c178bef0420471cb3cca18bf315c82ca6733a722b0d02562
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external resources, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farms on disposable hosting suggests an attempt to obscure the ultimate destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1a6fdfe29270b22b82ee1c45c5b73dc0/pigosu.pdf
    • https://swift-tw.com/lcc/upload/files/29615595294.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/bffdbe9f97da3dd95fe06511af4516b3/vobelufob.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdbc100b44---ruxuj.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a072be114---nebazopenagefixutixosebog.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0674f6eca0---57086813970.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/af1548682ef894d491fd1995640eb143/48421788070.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c518e45845b---31453185324.pdf
    • https://arch.ua/ckfinder/userfiles/files/70839737811.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16097df5ab31e8---19331910912.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8977d1e628---61121473916.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aaed056f890---17006820216.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/e0a66ba00f1d2c5df9fa8376ca214235/dutinosidad.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/98388297406.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b0ad57df371466dcf0c928677f07c4c2/53685535209.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37541147672.pdf
    • http://talleresjpg.es/img/file/xogipizopowebezejizewi.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/00ha8jfu85vve6tfr3nlthnmlp/rewamevogunarozuli.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2042305af61351a803c895e636e1af02/loluwapevezezojomejax.pdf
    • https://detmers-kontejner.hr/files/44814442927.pdf
    • http://reunionclass.com/clients/7469/File/famixevojogipokew.pdf
    • https://b2cexpressdemo.com/userfiles/file/jaled.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+does+ft+mean+snapchat
    • 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_off0000e41d.bin
7e537ea128f3406dc772fef2a787c569e19635918a12819824f5ba080943830a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 17064 bytes
font_01_sfnt_off00011066.bin
aebe29810c46775db0b1cddeb868d4d95b5563162870696fa42c462a4709350a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11066 10640 bytes
font_02_sfnt_off0001289d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 16792 bytes