Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f61284e18494157…

MALICIOUS

PDF

88.1 KB Created: 2021-08-08 00:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af2c9c24cd3cd473eb52d1ad19d64097 SHA-1: c562c34a55fe132ac515e165f662eed0022d647b SHA-256: 9f61284e1849415794aa1280321e0e2d5aba0ccf1c6a9443e43cd3f2b087099b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by redirecting users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=how+to+fix+your+car+cd+player PDF link annotation
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/0l75s8lc5ddc8p96lrerl1v7r7/padasasetevodebegow.pdfIn PDF document text
    • http://vce34.ru/attachments/file/funemoxovabigavasuvid.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/96346320811.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/s740f2ucihk3l4pg8ihb3bngga/vuvelowidu.pdfIn PDF document text
    • http://abnicum.ru/files/file/dupebunalevapojuki.pdfIn PDF document text
    • http://net-marketing.hu/images/files/kunusevetepuginasud.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1c51f52c6c80895a90d95fa8db9e3a82/zidolefufawonibawa.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e04358cb5b56eea16af9ce722d7fb8b8/tofawokasa.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/62659670408.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/veremopozebifigifepuki.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e7a438db57160ad146db726093c43ffe/19937885293.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/bulelukifaluvoxodobabire.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/99e1307c1f72e4e1dbb4a74f0c640bf3/15512860773.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608394c126443---76655410715.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836d42d836---danegifalejoso.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/kpvefdc2do05svdo314mur9ulj/82460910136.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a41c84ed3542947f384d3454eec617ff/23935827974.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087131d08f42---niwogujibirofososusaxi.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/74862351531.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/54429146541.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/finutox.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/xigumimemetirewawo.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/13691206251.pdfIn PDF document text
    • 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_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 16608 bytes
SHA-256: 94a87db817974794c6749ea823703bbced7fad1cbcf13f54b912fef49dfcb41b
font_01_sfnt_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 10736 bytes
SHA-256: 385b06ca81a6fcfa6e549d87c555023c5a36a34e9e1f9dc4faf2268a3d44defd
font_02_sfnt_off00013864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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