Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45ef5fac74eecff…

MALICIOUS

PDF

89.0 KB Created: 2021-07-30 03:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0898adf6d91b461243498a6130ea5980 SHA-1: 7dac0681894468eaf818dd9941c0e9a81ab4fcda SHA-256: e45ef5fac74eecff4c543d2a8f113a3a0d1d68f7caef11d4e860e47776553596
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting it's used to distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076890679962---85022163709.pdf In PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ca55a74cf---89722502242.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a65fce0f221983d6a65857e6710a48d8/wotigexegojebogoxot.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b34b57bfa5d94b8bfb83a965592551c6/levupeluvazolizebatetekuk.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/zoloxerivofipoxa.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/19908327444.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/sozidutupolinanozen.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4u9adno4dglph03cvq0lqo4ahd/87509013812.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/varupemebusoserafimirof.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c10f9d92b---46429510405.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1830373a64---buluwanitavugefitovol.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/12917068988.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/tafitelixasu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607adba7acf11---35845731597.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/junedosujobixemafe.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/58062079027.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/21151143813.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/181df4fdb903d0fb56c05282f08078f9/25264709479.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/jonufutigobodibe.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/majakugepulugerat.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/vorekoxiluz.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/fiwavimarewevam.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/nuzajel.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607966b0ca97c---wudezuxinuta.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/31262034594.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5beddd5ee6---gawojuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=history+alive+interactive+student+notebook+answer+key+6th+gradePDF 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_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 16968 bytes
SHA-256: 61da746f3b9683d226dcc316168c1f603498aa06f6ea75aedefe62675233eee4
font_01_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 11404 bytes
SHA-256: 98378440ccae1447669ee407e013e90f2eed5fa9e6807d4a324f771dc9ed8f66
font_02_sfnt_off00013d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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