Malicious PDF — malware analysis report

Static analysis result for SHA-256 1012c4af795a3072…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 00:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9382979a9b0dba0515154e864ee5527b SHA-1: 5f926a965884b7c38afdd0670df7b51a3a83a762 SHA-256: 1012c4af795a307235662c2f762f440b82e3d259937c800b08e64c70b286d442
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://biurod9.pl/public/userfiles/file/59405841293.pdf In PDF document text
    • http://jarosi.hu/files/file/paxomoselukixajiso.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b8a469953---lunukuvazuxelakavinilezo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609487351ff8f---losofoboxen.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/69164607435.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xexolaxodusatenulamane.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/246f991fbb8f50e57e0dd7c17563aec5/sekexarugiwelitefa.pdfIn PDF document text
    • http://computerdoki.hu/user/file/75290934227.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/58492100350.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/32658229852.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099ea204989d---63583159108.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7983df16c---29802543009.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/pifaxofiwadavig.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/27434324745.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/738b1c190e8cb055c79aae874a7bc416/82852147521.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8edd460ad3---vakizutezazukevobibufe.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/405252dff2882c957463d997bd6674dc/83383558001.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/mitematidem.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/lokoxunixegoburexobime.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/giwofuni.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/desidunokujiwamatep.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/tesuj.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/9d1b4f007c15557c7e8a89a1953b0ecd/magepotozajifopifepewe.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/46990254368.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/tetowavanunefel.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/83210688701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bibliography+samples+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_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 11052 bytes
SHA-256: 70b724549d96bdba9b7519b0063e2ad6215f232a4ca76e0fa1d70b6277b70e65
font_01_sfnt_off00010aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA9 18220 bytes
SHA-256: 44cb2cf6de46dad837994334261137e23fc066b9e28655dd8b39a0c9943f0f6c
font_02_sfnt_off000139e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1