Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b07f67c161f0ac…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 04:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cb53520fc2076d58f0f921d1bdc8700a SHA-1: 70fef807d91b1d28d6ccb2bd7929b1c77a14a22a SHA-256: 75b07f67c161f0ac2da13cea6f22dc3f3bfe5d8b5350db987e7200f7dd56b66c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://collinite.pl/userfiles/file/98128657376.pdf In PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/14202486409.pdfIn PDF document text
    • https://digiconelectronics.com/media/33194894225.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161386ec194c6d---rixuxemejezoluxoponunem.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210908_30DA12B7BD58F675.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/miserujej.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/wowalivubulada.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/xuxor.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/giwuge.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/94424232327.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/9cb45ca1e79dec2d490e0d026991a2ed/giwow.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/foralobirivos.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/sijuxabasipivenekaworus.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/naniraseropulerefebebipef.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nasijutabivixapodo.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/foful.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210911_0FC7C953404A1840.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/vewokifumagotulasenorep.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/66420159369.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408906551cb---91591036679.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/vugubafeganitigola.pdfIn PDF document text
    • https://preciseenergygroup.com/media/44360047934.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/pigesowidomotivajikixad.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd7262da1d---bibukupubiwivebufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=la+armadura+oxidada+pdfPDF 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_off0000d023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 10268 bytes
SHA-256: e856ada6313ed030f026298e466d6f18cde8fd9c4557d5aab7f72d238909ed1d
font_02_sfnt_off0000ff40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF40 19100 bytes
SHA-256: e4d41bb9573df8ab202b2d4c7aa7055516db0eacbfc50ed8b4228ea3b765d96f

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