Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1652e4ee8dd452…

MALICIOUS

PDF

90.4 KB Created: 2021-09-01 04:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 542d1b85b3306b198c840b5019dc546c SHA-1: 1b027c874a1dd059594524be66b8c071ae40ccc6 SHA-256: 1a1652e4ee8dd4527de6db57fefddfd8ad1b66198bd64459c9dfe5510bbd34d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://trevelsi.ru/ckfinder/userfiles/files/24882815521.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/auekbvtpcb9clsrek1it0anqeo/xujadomonak.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/78717403189.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/28896148677.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202108270625306689.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/652ebb53ff38a8da92a1a5b54abc8eb6/97167237832.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5c99dcf48e41828b413c6970c558ed5c/58065920520.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c127e5ba87---dibivoginiraxox.pdfIn PDF document text
    • http://dzbnf.com/upload/file///54745542560.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/gebetovibige.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584024dc7e---rufuribepu.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/budututapajubi.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/pubolipigeganiderujiruwo.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/sumetarukup.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/dasijilogivunodere.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nudidivitomenetanaxani.pdfIn PDF document text
    • http://mcutech.net/files/malosipejiro.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/mipigalutudax.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/xojobavijavi.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/59048553938.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c386827aa6c---40346785589.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/5926140751.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/53594268276.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/77741604007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sat+and+act+scoresPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 18100 bytes
SHA-256: 0e5119fb5597fafb854f24d10a7464158d09e1a1711eb1b7a55ad36002d9268e
font_01_sfnt_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EE 10300 bytes
SHA-256: ae8023547f248b260546412e2dc6ff0f849ad32c31cf2e6e745ad2e24e1789c2

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