Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2a06105664dc21…

MALICIOUS

PDF

75.8 KB Created: 2021-06-11 15:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 449079afb9b004b7a613abcbf154dca6 SHA-1: beb3e14ac8e6ab102abdab06e22308117d230360 SHA-256: 7e2a06105664dc21ccc60edcc0181e003cc880927e5161a39705a3e2ad1a08b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute malicious files. The presence of 'utm_term=dsi+emulator+apk' suggests a lure for users searching for specific software. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=dsi+emulator+apk
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e4f7567f---8924351501.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8ca6d90abab9e295b640e6cfc54bf789/wiwukokuva.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fb5a62c80bba7f05bf3b6e3f949acaf/vodepi.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608603775a689---tazanotudabekix.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9vs3jpqrh3it2osnnj2bm7pun5/ponoduju.pdf
    • http://rasmesafar.net/basefile/basefiles/pekowesela.pdf
    • https://vansuloi.com/uploads/userfiles/file/88802786348.pdf
    • http://alfavit.tv/userfiles/file/67952856646.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5dd453dcf---6078489681.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb782b579---69147902662.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210602_A3CEE4E1B072CBF1.pdf
    • https://foreningenflex.se/anvandarbilder/173/files/38233957265.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/l6u7vfioc0ukoeb110ifbm3cm5/41660206844.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609471ef2a3df---bizatuxedelonolitawewitid.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/49cc37f866e3e5604dc1c47a513370a9/88311445223.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb94.bin
92ec234f0e5350b6c83c16f48014485b13ad1925cc18669ac4a2310ecd7081d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 5028 bytes
font_01_sfnt_off0000fc99.bin
5352e9b2b867c6a2292f6fc2adb5b4856d2b8bb65afc78dc18445ac5f706e344		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 11368 bytes

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