Malicious PDF — malware analysis report

Static analysis result for SHA-256 e722dc29f9d69f4a…

MALICIOUS

PDF

184.4 KB Created: 2021-09-08 09:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d79ed7c46a0eb29d61e55b8ab02f32c SHA-1: f0e6048556d3f8f3a95599aa36b4eeb966871f3a SHA-256: e722dc29f9d69f4a486fe7df6bf288001e7cb31cf624b71e991f3b52d34ad75d
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically by instructing the user to install or use a remote support tool. The presence of numerous links to compromised CMS upload directories and the ML classifier's high confidence score indicate malicious intent. While no scripts were directly extracted, the document's structure and heuristic firings suggest it is designed to facilitate the execution of a malicious payload, likely a remote access trojan or similar tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160843620b6c2c---vevegasagof.pdf In PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adad60b6e1f---modalojusugeduxi.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1611ea6cee8fec---86113232618.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/c30tenu4saq3r3hp5h80vdjini/49996900073.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/24894684619.pdfIn PDF document text
    • http://absigorta.come/file/sevar.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5273c3d6e---55963367052.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/kobejejexok.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fbf28248---41290440405.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/4ca40f95e92e232f3c0b479ac8206ee5/50742864874.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc33ca340---pukoxizetetupom.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/10007785154.pdfIn PDF document text
    • https://rajakedua.com/contents//files/suwib.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/34f5f5sfh3t9usu7hn4kg3mho4/pidagevawuledesekokoki.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8828bead9402eae95551fe235ef1e9f8/gasiwodugexelama.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d49a8067546973ad42c800717e6381b6/fitojixune.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/pu5jlqvpbis8s4hrh971nckkdn/90298828914.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead8a0befa---6329912374.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160794306298e4---faguzekumozigirawu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085242bc3bdf---53767184801.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/wasemipenesisoxusolo.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/xenusekifonatag.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f62a98490---52177206342.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/49358048777.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/dosiwagewuvimosebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=operation+yellowhammer+document+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_off00026dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26DEC 11044 bytes
SHA-256: 27729c23d69f674bf247cfb36009745ca71af50ceae0c59974e905ebca151e45
font_01_sfnt_off00028778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28778 19196 bytes
SHA-256: 63b7150df300c10b8987fa8db5719ffedce18a62ee267c68e67a2bd40f55d617
font_02_sfnt_off0002b94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B94B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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