Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1d258a6f562dfd…

MALICIOUS

PDF

98.4 KB Created: 2021-09-07 21:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8d7208ae65c7ab808283bd20a0207fd SHA-1: 64941172786980f4ef25f0f1a2c339fbe4d8cf3c SHA-256: db1d258a6f562dfd3650a61da68082cc2cc5ee426e8c74008c03b40eea518fb1
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. This suggests the PDF's primary purpose is to redirect users to malicious websites, likely for phishing or further malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=emotions+revealed+and+unmasking+the+face+pdf PDF link annotation
    • http://jingluo.net/uploadfiles/files/febaxibokekonudot.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a51768b15d---12649172002.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/20387090092.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160732fd766476---41714814303.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/divonigifemegival.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/98pf7ade6f9e5oafbs1bstdo20/gemobomadilepafewu.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210724_6B0ED1800B1709AD.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b9d13fcf1f4b2ed2323928c893b0556c/15313166808.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/65120450625.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/rujuzofomiz.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/damojivadunuvovoba.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/dowaxojulebaparut.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/72754700273.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/tuwilimenulemozelide.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/dapemetojedepa.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087663a95705---79871187271.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/3454706416.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/fikutemafovufubimazesemuw.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160775c0aa0dfa---94682254311.pdfIn PDF document text
    • http://519pf.com/userfiles/files/34230457820.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee867957d---jaduzefukojosasiza.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/62217102297.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/26635347568.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0795ba44c3---xupepog.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/zelekev.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210602/210602123820643710jvblzgoy1mgf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 21220 bytes
SHA-256: 0ff68f325b3f1fcbc942b659eea183b2e694d2c1ff760c9e704a9d9c64f5923f
font_01_sfnt_off000148a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A1 11308 bytes
SHA-256: a66228529a607d7528ad2cc35580d4e0f4afe3b390a3171706adee2ceb6e417a
font_02_sfnt_off000162cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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