Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e46739d0334b56d…

MALICIOUS

PDF

100.2 KB Created: 2021-08-10 22:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c23a5d1bbf3f15eaa28c645f0395ac9 SHA-1: cfb03eb6844cd90714d16a25ccb16dd488562fde SHA-256: 4e46739d0334b56db6f7f911093ff4a6538ee117cd3c50278c5d42242a093534
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirection to malicious sites, while the link farm structure suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • 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 http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/72c32c524a366c7cabc40f03e80df214/37231463847.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160868bf565353---muxubosepusup.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/a964ad5444ac2c61b26549ab8d02dd87/sesasivipeletes.pdf
    • http://illinoislivestock.org/userfiles/file/95697148643.pdf
    • http://instant-image.net/UserFiles/Site/File/fufurul.pdf
    • http://gayaarchi.com/userfiles/file/20210623214812.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/2rlh6vsc8k6fdu4nan2ho8f7a0/7632422625.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b871fd35847376ec7f879e6ef8133c9b/ramoko.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/59963296293.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u96dss37dvqapasil4rme3s6vp/bufovevukupelovipisikizi.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1d43e467461f7dbeb1813559dac13643/42194807399.pdf
    • http://biomassasia.net/data_ed/userfiles/file/73268593419.pdf
    • http://serextion2006.com/js/upload/files/84915894237.pdf
    • http://scamps.biz/userfiles/file/78350461591.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608573a1b0460---65058362429.pdf
    • http://kapsalonvogue.nl/files/file/1017425272.pdf
    • http://industrialdevices.in/uploads/66891602958.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/tj5jlbj5q8p3i23vnon0eejf1g/luvazixejazediwikavus.pdf
    • https://cmetrix.net/ckfinder/userfiles/files/kexugaw.pdf
    • https://tcremich.lu/files/files/mejoxovukajalu.pdf
    • http://gillsandgeckos.com/userfiles/file/lodibasotojolizabuxejepo.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850ce31a620---roxuzaxomitubawogux.pdf
    • http://schule.havonix.com/ckfinder/userfiles/files/xivenovolix.pdf
    • http://hoangduy.vn/vn/files/nijadop.pdf
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/78339440128.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dsp7112tnphtmq5rkh2vgj3k1p/37426286755.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=digimon+world+cyber+sleuth+digivolution+guide
    • 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_off00010e92.bin
babf99464a614c4821b510398c74163879f8d6c36d5fae356dbbc37b78703b43
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 25976 bytes
font_01_sfnt_off00014fcf.bin
c9bf8eeb91c1539174a2c644d4f81270544cd0938d594625a58f0882015c53d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCF 11160 bytes
font_02_sfnt_off0001698b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1698B 16792 bytes