Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb998db27d55a631…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 06:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f811e2a4791cda64ef80b4868943df8f SHA-1: 568b8a29e286a21d321c0146a7f19e5445c09cf9 SHA-256: bb998db27d55a6315668e8801b8b8410700709e45330d02d2e8aed5f2643987f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to download and execute additional malicious payloads or redirect users to phishing sites. The presence of numerous links pointing to potentially compromised or disposable hosting further supports a malicious intent, likely related to phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://debden.org/userfiles/file/lolozodejijuwewuzibufar.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce167614c---xumozigusenijinu.pdf
    • http://alexlunacoach.com/img/editor/file/lumamimaxodatot.pdf
    • http://preserveproperties.com/userfiles/files/74461220159.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/eghs5q5t4tm2kh7p3juicccj36/gajazunejikena.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d48cfe829e7059344bf975a4d4391553/13547481211.pdf
    • http://anandamsanyal.com/userfiles/file/69590133865.pdf
    • https://kingcarmotorista.net/uploads/files/xixupu.pdf
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/rugom.pdf
    • http://melvin.cz/data/sodok.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/8c578a997d0f145c247f45c5accde8df/18384062805.pdf
    • http://madmojo.com/fckupload/file/netajegodu.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/68o7f1q683m16i1kn3e7ae4n66/56927774293.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/vii4q6oek4h881fe5ju6q6mtm4/72271478249.pdf
    • http://studiomanzella.com/userfiles/files/bujipojagawefobemibaz.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e80771ee52---zoxofumasuvagaso.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qor19q2gbeu78dntmld0qbc8rk/18679931608.pdf
    • https://air-separation-supplier.com/d/files/risoxusokuxuju.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cec045b13---nuzibirinexonizudo.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcda655f7d---69942819333.pdf
    • http://yossy.biz/userfiles/file/sadizedikakowupomilejula.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/nl9g5ntb9furqqs7fftaf1fele/21032583523.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=critique+of+pure+reason+norman+kemp+smith+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_off0000bccd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCD 16792 bytes
font_01_sfnt_off0000d4df.bin
b75bf9af9905cd48ee2a69459dbe1e4bed013fab30505d7c1d96d5d6c7a8f6a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 17180 bytes
font_02_sfnt_off00010117.bin
094a0c9d35c00036537a1c5eb2a13eb448d8c226fde49db33a492cb78d7d5863
pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 11084 bytes