Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8fca93cc718d42…

MALICIOUS

PDF

71.0 KB Created: 2021-09-01 10:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3af2a0344632cd38916169e6669f35d SHA-1: 91e1cd67989ce5b4d1a35ee96fdbfac95c85f814 SHA-256: ad8fca93cc718d429a270603100abc0005299f568380b39ee5b28de908d7e317
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, pointing to compromised WordPress upload storage and disposable hosting, likely to distribute phishing content or further malware. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links and the nature of the heuristics strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8ebfb73a574c95dc075f5fd6c6dfa09e/88969527971.pdf In PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad8611f08---98814842166.pdfIn PDF document text
    • http://apsons.eu/files/file/20166144068.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/077togejb0ioumherpbap7cjj3/95680636517.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/65142761097.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/wenanofolirapajigixij.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/zikatoja.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/xilogig.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/76609806159.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/koxuvipupafuf.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/siperezavav.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/sumulizope.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4868bc306---jeweziturigaluretawamujaj.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/wakaxotetaf.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/xojub.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d961002cd4---13501194642.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/68090475165.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2960e0a26ac7c18dc451c5331af25964/xajeginatuteburuvefere.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/sitewe.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/49012617805.pdfIn PDF document text
    • https://actorconseil.com/files/file/87392004011.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e0694d4f111415d420dab20dbfa38932/57606693733.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/42247393776.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946596da5e7---todumubowebare.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/zijijekategeluke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what%27s+the+best+way+to+make+hard+boiled+eggsPDF 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_off0000b70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70F 11052 bytes
SHA-256: 5f29c53fca2ebdbca85decce1ef08f40bb53fc6fda8814680c367cca9ccacf32
font_01_sfnt_off0000d0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 14856 bytes
SHA-256: 11929cbce60be5b2df84d2ad537740fe9e70578c3dc6000a9c743a6b9ddff116
font_02_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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