Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea691119319e211d…

MALICIOUS

PDF

108.2 KB Created: 2021-08-08 05:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ae610dea3610bc537874c5f453f0b3f SHA-1: d365d8bb80bcb0356d0511171948fe0566fa291c SHA-256: ea691119319e211dd3c4a728065cf36d3e59d052e5e63371b41e283f19b5a4b2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous websites, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure itself is designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://accessiblevehicleservices.com/userfiles/file/73603721801.pdf In PDF document text
    • http://mid-europe-ex.com/images/blog//file/rusulipebikawinututofuvux.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ac4ac43192fadfef2d12319d6e789609/35431280385.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/85j8uf73vshqrst2ec7335b5gs/xurebagunufokagujuxanodu.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/giwapidojasuvip.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/20807756694.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/5a345af79b1a8a401e8b1da194087d52/18693922398.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/51137821904.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/97803557171.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080597b73619---1201713953.pdfIn PDF document text
    • http://flexicourse.cz/res/file/93691932673.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdffaa72f6---gijapilubefa.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/koxoviz.pdfIn PDF document text
    • http://ave-france.com/pics/files/14059509413.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kosilediwogotuwabitadeji.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/69728999595.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/b99eead1cc41c0720a45e496ceb707d0/betupowojupi.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/mazupivore.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/d1cmu8l9up932gcolpokell5nj/15488975772.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8d7955216c2136726579a2a7d5d9d091/28330195989.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/59df5ab1745419809367e63c339ddaef/49815839129.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f640008352---kawimelulizepasa.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e8651c96---liruwexawi.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021061012264540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ejemplos+de+funciones+trigonometricas+aplicadas+a+la+vida+diariaPDF 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_off00013588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13588 21320 bytes
SHA-256: 4b89c6aefe91e190695f1047e56a3104ceabc6e7e686f5e86bc2508aa885315f
font_01_sfnt_off00016d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D46 11240 bytes
SHA-256: 96539bd1342ddf9ae7f57c3cfd985223cdbfa9cde572019692db9a6411a9e592
font_02_sfnt_off00018766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1