Malicious PDF — malware analysis report

Static analysis result for SHA-256 804fd1eef8bf98a0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 06:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 398ead5b2a1103f3b6e2eaf8e52ac27a SHA-1: 8e4b723f81767d8274bd3b95c60ccc48041bc18a SHA-256: 804fd1eef8bf98a0dc4e86abdbe644d07c0849731086141528ca2deaf6f7b34c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=wonder+park+full+movie+free
    • http://positiveforce.in/uploads/files/felonoxuxamoxodis.pdf
    • http://kolbiko.com/images/uploads/file/siwapabanigetikulepatelu.pdf
    • https://cingenito.ca/upload/editor/file/88785239786.pdf
    • https://ottopianos.nl/files/29920301265.pdf
    • http://mibenjamin.com/userfiles/file/51931926288.pdf
    • http://hoigolfbinhthuan.com/users/files/48513500142.pdf
    • http://vitalbafitnessclub.eu/userfiles/files/reduwefinabavezed.pdf
    • http://lifebeachvilla.com/uploads/image/files/79273024467.pdf
    • http://fongyoskert.hu/userfiles/files/lovanoxojawulanejolenafik.pdf
    • http://maskaevlawyer.ru/userfiles/file/kowozoluvafotijesidi.pdf
    • http://scuderia512.com/js/upload/files/piresirevebaboni.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/7773097185.pdf
    • http://oldmotorsclub.com/files/file/36519743512.pdf
    • https://ropaalmayoreo.com/images/userfiles/file/lidujuzafal.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/semoxo.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/16477586915.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613190e1d8183---46174846775.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613febfcce8b8---24885138175.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/jojidojenop.pdf
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/61909924338.pdf
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/99326703910.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/jagajipefuzifov.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16131350cccffc---53589110097.pdf
    • http://ovecollection.com/royal/admin/images/products/file/funidijebivugelaw.pdf
    • http://makesomenoise.hu/upload/file/potobapinezetexajotupepuk.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_off0000dcce.bin
02916ee866c58545a00e01a298913fa73789c410086f7df4594021526378a9bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 17764 bytes
font_01_sfnt_off00010a6e.bin
11346908472aae277f37990afad405139323a2759ac1aae094a779dc6b1dcfed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 10644 bytes
font_02_sfnt_off000122bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 16792 bytes