Malicious PDF — malware analysis report

Static analysis result for SHA-256 0499e88b6c6d1b58…

MALICIOUS

PDF

88.6 KB Created: 2021-09-06 00:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2cbcb52c61f61b52704a217a82c0744 SHA-1: 6461c7f0c5fd812e8a5a4d42fcb580ce679ed4f5 SHA-256: 0499e88b6c6d1b58604d8ae117fa4a76204906b4e6f636a8fe7c351143a66ad8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute further malicious content. The document also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921714dbebd---xobalolipo.pdf
    • https://matteagianotti.ch/userfiles/files/25383526307.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e396bed1c1---42925935618.pdf
    • http://patriabrno.cz/userfiles/files/tolizujadaz.pdf
    • http://shengnabei.com/uploadfile/file///2021061720292053.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49887b5d95---86614771397.pdf
    • https://diedacorporation.net/freesiafiles/file/42053404252.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6365b07092e7ee14274de68b5dbeb2e2/kasaxoromomogovetude.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97040514732.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/laxakunugibidikanuzakuvuk.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad26285873---74559877883.pdf
    • https://chmelo.hu/sites/default/files/file/74566792737.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e631f70c603---83655885453.pdf
    • https://al-wesam.com/userfiles/files/44685453156.pdf
    • http://sk-massimo.com/js/upload/files/6410967002.pdf
    • http://medi-sen.com/files/files/22568842060.pdf
    • https://webshopplus.nl/app/webroot/files/userfiles/files/78019705371.pdf
    • http://www.binghan.my/userfiles/file/jilidapemezologidomi.pdf
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/9543410066.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fourier+transform+pdf+free+download
    • 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_off0000ee3c.bin
236c8c9c1692bcbf996277237f000fb91f5c7cde688915c8fb9770b15f7fce48
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 20288 bytes
font_01_sfnt_off000123d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 16792 bytes
font_02_sfnt_off00013bee.bin
a98d7455ba6684d295136edc045e13307b684b21ecf6ce1ccb71f08e06423fd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEE 10824 bytes