Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53898d838bce440…

MALICIOUS

PDF

87.2 KB Created: 2021-07-30 19:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30249c1f9148939eb68240972eb5ed9f SHA-1: e8f64402c754f9a26dba1ca1e56f9b57e400e8b1 SHA-256: f53898d838bce4409c8a506d8a8f33280d47603a21823b15e2340418ddf7999a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/kib2t8tgldgsc508cn08vbnr45/96650272731.pdf In PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/75744551710.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/nexogusiwi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084f8d3a7c70---62841040862.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/0b1d56fe69aaf9c18bdb5cd5335e6a84/73559228367.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0a659d3a2---zijorokifogidapipugew.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/2d32pggfddcj3ag2lled71f6un/5762795935.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3a1f40cb---sodofafedazivuvopuw.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021072001153943237.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/subigomi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/137e4373a2c456cebf2bf61790baca5c/sawomub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf49b5d1db---92667711202.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/81655783229.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/25943523290.pdfIn PDF document text
    • https://aedwea.com/upload/foto/fesarukozusiletiwup.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/mokatijufu.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/dupugerubujizigamuso.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/watavaminawoxi.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/wopodiliz.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/rugamidov.pdfIn PDF document text
    • http://lobi.md/userfiles/file/85128437492.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/xodolireno.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/tipotokotegex.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/nupukobusakawase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tema+sul+riscaldamento+globale+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_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 19104 bytes
SHA-256: f6d8865ff210127457816e46fbcc394c186125f294bd5d7be0f84f2f27ce6e72
font_02_sfnt_off000133d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D7 11168 bytes
SHA-256: 27fae6f0950afea0eb16d1fc915b4b644a35d0762a952e26208b0d915dd51c7f

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