Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2c2694cca88c3a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 18:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: de36765ac747b821486e32d2429c806b SHA-1: 51b1042d79c2b5d275f1eda42f5b1536fe4055e7 SHA-256: bb2c2694cca88c3a5d4443d0bddf02fb05373ed72307025b5126fea079686888
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the document's primary purpose is to lure users into clicking these links, likely leading to a phishing page or a further malware download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 https://chcial.ru/uplcv?utm_term=2011+jeep+liberty+renegade+manual PDF link annotation
    • http://cyuanmei.com/userfiles/file/21742950739.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/86017896531.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pson167eoa97ui6a49rc06pilh/57864075256.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/29969049664.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/19198178027.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89359491318.pdfIn PDF document text
    • http://hk-keber.de/images/file/podoxotevafinoku.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/wiwafijajevabijetik.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/21dc76b958b47c355b9a39c4c15e0fe9/dojorefej.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/72264412079.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/wuxogorojunixajirazor.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/79142255900.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/82120725061.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/84176086493.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/59537536991.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9daeb057b---54141140918.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/93862013674.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/70699365139.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16087d633c5d91---51826640064.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/53331669090.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/17059508106.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160836e81b2f01---54227129370.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/80934bb7cc960e284c38541d99d22517/fesasidawiparoziris.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000cc51.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCC51 18384 bytes
SHA-256: 15d822860411d9a73f2f5328dba0868717a8bb362ce75d841300d5f800c7351a
font_00_sfnt_off0000b440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 11128 bytes
SHA-256: a51283e5f516223a423ace3438aa52e6eff4221d8e8e99f2a941640e524ae780
font_03_sfnt_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 16560 bytes
SHA-256: 2293caaaefa9074190238e6d55d216fe6313415ffa880c6b1a69a7cbfe2d61ce

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