Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a6518250d3f3e9…

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 00:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 510496e18b426a44da3a6f07c1e80ada SHA-1: 6232d022d3cdc5ef3f47281dc7f67ed2555a9c97 SHA-256: 99a6518250d3f3e9c4f4664f1e4acd8374071779922738bf57fd1d97357f664b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=when+is+the+exam+in+spanish PDF link annotation
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8417cf10e24250076f936fc29809ba89/tegebomozuxuvuramavos.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/bozogekosuf.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b84dfd1e3bc80488cf48d7329724f336/siputefezovalolanemanemu.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/0db998d530fca15ce4e4e8d389553168/10413445700.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/gixawoxadivoder.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/bf6bda3c3f210227b2fe48aaaf395cef/wafojum.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cc1538f3---12090281602.pdfIn PDF document text
    • https://istanajp2.com/contents//files/vekitirep.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/zepavefixupamakamibiwusuk.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5617c258b0---venexozutupilobaxet.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7333a75eb3---78770638296.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/21063501675.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090febd117d5---95953243421.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909309e55de---zemag.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b50449c3011---72870860502.pdfIn PDF document text
    • https://sinarwaja.com/account/files/41275116993.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/cea182e2c7b9d1e510bd81bb1d38a17a/desozoxupobibomepelusa.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/xukuzot.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e4c4b75c---51648172803.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/893f97b09858e475bec7c74020262127/xenitenonoravaxijitisi.pdfIn PDF document text
    • https://pmms-online.com/assets/file/bosesa.pdfIn PDF document text
    • https://loctra.net/userfiles/file/nusopoxu.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/paligosijikutiranudafefu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 18784 bytes
SHA-256: 11e9472b7b8b42df0b12c27a56f3abd6670c50d4d1e6c76f74b5b0bc4212bf2f
font_01_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 10344 bytes
SHA-256: 272cbe3f9501bda394605d4b280b9ebe7af1e79c202381d4ef7b960b9d3c5d36
font_02_sfnt_off00013cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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