Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c688aeaf487c77…

MALICIOUS

PDF

78.4 KB Created: 2021-07-08 00:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0fb814eaec105b512960ad5c217a000 SHA-1: 7a0b43ea029dfe0c2f5969175cbcb7d99d290571 SHA-256: 88c688aeaf487c770382c1f8adb1933a4e38b379e08f0621e0b3ac16640df7ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. The presence of external URIs and link farm characteristics suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://oniceh.ru/uplcv?utm_term=entry+point+not+found+dynamic+link+library PDF link annotation
    • https://victorybear-info.com/userfiles/files/7201511279.pdfIn PDF document text
    • http://ahchala.com/img/file/zetatudorukabipi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/810186676ed7d31d2b0f886ed515432b/64139135480.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/kajudojigojogone.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb605770e---ranoriwudetagujol.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4234c6b16---narek.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/56329591546.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/15092760113.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c2e971be831455794b7fcd3ce413e094/guvaxef.pdfIn PDF document text
    • https://hsse.cl/files/kobuv.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea975da20---84250998683.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/81141848714.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/38pgq91rcve3k5avtj371o33j2/nojega.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3539384715---38000074769.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/49313225900.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7379db2417f6253b489056abf1d108a9/12959953693.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160840aa49f009---54995880045.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/timawimoxebemupezadupuba.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/bevebowab.pdfIn PDF document text
    • https://patc.fr/imagesfile/pivizejexaxinib.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a0aaab58---xovekemapapi.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/72c14ee4ac1e234a4031f4065c02f562/norepob.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/76e3d35615346601923f4b78f93b1c13/volat.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c7c7b5400---xirurijobo.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/89353980328.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160832d140f69e---kopojigomilerujam.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_off0000ccfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 17504 bytes
SHA-256: 0371d81bb61db0bd3eb3fa99883128d0d270a037cc3892fe8719ed025c33e020
font_01_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 10908 bytes
SHA-256: baf3673207fa00da87a8db9e8a577eb00f7d950c3b730e02078655fffe56848d

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