Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1f9055a37189c8…

MALICIOUS

PDF

70.0 KB Created: 2021-09-17 17:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 951de6364c9735265de767a447ab8e98 SHA-1: 604922e741606b62aebe81352b51c1c0593ecb91 SHA-256: 5a1f9055a37189c83d62091aa84518ddc40728bc66b424f1c06548ab6bcefc84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript is likely used to facilitate redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=dragon+ball+ppsspp+android+download
    • https://cmf8.ir/data/file/tazonemivo.pdf
    • https://artistprasanna.com/userfiles/file/89543037630.pdf
    • https://rt-totaalafbouw.nl/userfiles/file/memifukarabinuxete.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/11802169667.pdf
    • http://lubrifianti-auto.ro/files/file/feduruvatedabirizemadi.pdf
    • http://cardealer-space.com/js/upload/files/1526029120.pdf
    • http://labsshop.com/d/files/5072640289.pdf
    • http://e-photo.lv/ckfinder/userfiles/files/67788701826.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9da006c40---21867447696.pdf
    • http://zezoalza.com/ckupload/files/95245926900.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16134901cc8d6f---83593752901.pdf
    • http://csc0351.com/userfiles/file/20210905035408_cv3fuf.pdf
    • https://kuzeyilac.com/resimler/files/bavesuruwuzus.pdf
    • http://3gr-group.com/ci/userfiles/files/rorovomexatewapirakot.pdf
    • https://safrano.pl/userfiles/file/74873306836.pdf
    • http://zap-interactive.com/uploads/files/segewu.pdf
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/61300615718.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/4339686611.pdf
    • http://fixafilm.se/userfiles/file/21800360145.pdf
    • http://dakdekkersindex.nl/images/uploads/ginedebevesosotebiw.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0013c4ff2---62750048955.pdf
    • http://innova-perila.ru/upload/files/tapokunikad.pdf
    • http://www.centralperdana.com/file/43474036257.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_off0000b14d.bin
6122d8fd0e77e4be7505b82e63f0987f13fe3492f3f1806f53c608b8c9eb6d7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB14D 16060 bytes
font_01_sfnt_off0000dac3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 16792 bytes
font_02_sfnt_off0000f2da.bin
eb4f4731e44dd857e45335103486df1806056147ee63a843325215d2efadbc20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 10564 bytes