Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08428cc56949a23…

MALICIOUS

PDF

81.1 KB Created: 2021-06-26 01:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b38fcd0ea5c43f047e6b7e5c1873321b SHA-1: 6a8ca6c787806b12da6ca151b974858e07ea282a SHA-256: a08428cc56949a235b387878677c3e02cfecbe54b298e704eabef8e72ea227a6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest an attempt to host malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d493e22bc9---11853501573.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba92128562d---55238915216.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/05c0d82eed41026ee25bdc116ab66e8a/71971476023.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4fe8a9129---3390061166.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cf8dbf99110143f36e79537e6aa6c18/gozipemafazi.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/8028c708eb34897176789f24c383b371/wolofowewononurogesowon.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/7cc65a45c9a0d2deb7e19aeff7bb0c02/vedupeteri.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ee4d01b5ceab89305c2c3600a5448cfa/lovozuxadanuramoludanafi.pdf
    • http://katyababash.com/images/uploads/file/raruwikir.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c959a982cd7b5cea32d4e67781372a14/84695934031.pdf
    • http://hotechike.com/files/files/19186430123.pdf
    • http://anhopphat.com/uploads/files/98049775858.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/11855004912.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb6314413---74163839837.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a8d6df1e4---mapexo.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae5fb947a---89875359476.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2875e28633---36348274476.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080db284addb---gifak.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077abb58d32f---vuturepidigi.pdf
    • http://streathamtaxi.com/survey/userfiles/files/45936161236.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/su7as7nqgjc7f2cvn78ouc3n2f/67147417153.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/02caf069ddc4783f8345bdabc1f85c7b/zofemewevodewobaturajeked.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070acb41322c---21926959823.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2fefb61007b69b6a509b2db8af44c82d/nokajitejixuzogikibidiwo.pdf
    • http://rajskiewakacje.pl/userfiles/file/dirakorewiwoxoxapamote.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bacteria+and+pathogens
    • 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_off0000dbce.bin
ccd48ad9065614da5441b2ae4747490321d9affa8f7c91b8787e2f10ad1d7b96
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 10800 bytes
font_01_sfnt_off0000f470.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 16792 bytes
font_02_sfnt_off00010c82.bin
61534eb722163b95456cad1f06df46eb996554acdc7daad00a7d831448234238
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 15932 bytes