Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4ae11cd4c94ea2…

MALICIOUS

PDF

83.0 KB Created: 2021-10-08 01:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bb2d4de933252d042bcf91d254b82296 SHA-1: 6735c25cb30dfc9494c4aa2924923c6a133bfca5 SHA-256: 2a4ae11cd4c94ea2383320c0e6b8299b87d3c961c04f4bd844d969eb974d9079
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The document body is heavily obfuscated, but the presence of numerous embedded URLs and the 'link farm' heuristic strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bebaldebaran.eu/userfiles/files/66187032766.pdf In PDF document text
    • https://anvatsaigon.suzukihungyen.net/data/dulieu/files/jepibufirirewuz.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/66616721140.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/98584eed4d9ae73faeb4424ba1017838/widogogumo.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/wobakivuzapisularilufo.pdfIn PDF document text
    • https://papiratisk.cz/soubory/17754398342.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/3336691061.pdfIn PDF document text
    • http://sinostandards.net/upload/files/zamusemofiwox.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/87d2bd220bcdadf390b313112a6a998e/ribonofen.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/koxabujupofumekajesixo.pdfIn PDF document text
    • https://klaipeda.cvzona.lt/resources/img/files/58972286851.pdfIn PDF document text
    • https://thepainter.asia/upload/files/vujozozitegik.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/78273758259.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/23480977034.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/64377160981.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/gaxibos.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/5102906765.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/judotudupepigigiribuje.pdfIn PDF document text
    • http://digifast.cz/userfiles/vuxefivufavosagozilaxerox.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/pafofizul.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/76561971287.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/34412620188.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/zodikewemejotulewo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d93b8efd90---68346953864.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/44597733036.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/superepaxizajigozutor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=last+day+of+hunting+season+in+alabamaPDF 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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 11012 bytes
SHA-256: ede8991d3d7e3a572fdcdf93e362ef2cd591add5ea2bac2b575ef030242bb126
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 18768 bytes
SHA-256: db3a4f3089788ce95fb4834d60a79a7b9f0076645b13202c33e66bd5db9d3598
font_02_sfnt_off000125fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.