Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fd87c58f2fc5ca…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 09:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e98623a22e0aa597ae224c61c50a1f79 SHA-1: cee5bea2a4a01a6c9cbc6cc7754501e036045423 SHA-256: 19fd87c58f2fc5caa9706312b348d58e4223cd05538e71eb59a8906c7a4df46d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure strongly suggest it is used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=white+dwarf+magazine+may+2019+pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/52142710887.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072021e3066d---58432488539.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e0fc9072---36318110777.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091939d60d98---99319568801.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608319a0b71f7---wulivadokudugolekepejowa.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f7ac98cb3---12921601896.pdf
    • http://afgventuregroup.com/cfiles/file/30988712902.pdf
    • http://group-anons.ru/userfiles/files/jepevolugewuparituseluko.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3b29eb622---kenagogavozer.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/nrsfj3r1m5hlkaj2f2ndh0g711/togitataf.pdf
    • https://marblo.ph/app/webroot/img/files/pigeval.pdf
    • https://ludbaegitim.com/calisma2/files/uploads/ragizagi.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3aac0a0fb81adc19425c944034f95386/17366159313.pdf
    • http://blueyee.com/upload/file/201746189855.pdf
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/nojarigipupodexenetavorul.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f109539111---modapisuvoj.pdf
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/94501311783.pdf
    • http://oodow.cn/upload/file/210814192805083550gevvywbxbu8z.pdf
    • http://www.39koratmachinery.com/file_upload/files/giwitipejabapijezed.pdf
    • http://citadelcaralarms.com/userfiles/file/23366167363.pdf
    • http://studiotecnicomartani.eu/userfiles/files/35586389346.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a0176b98263dd44f7613ffcea0673ffe/boradetof.pdf
    • http://uticachemical.com/files/upload/files/44234125833.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_off0000e386.bin
619693cd8e64bad049457bd0dc335a1fa0541d528a850cbca9481a0c6657d6d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 18788 bytes
font_01_sfnt_off00011483.bin
b43526207f072dff042115adbc493d8e6af2e3b2f168d4a12ba9645448f15654
pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 11328 bytes
font_02_sfnt_off00012ef6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF6 16792 bytes