Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1dff65a3059d051…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 02:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f1f39137581ba031e2f4265af569798 SHA-1: b0cdf66120ba473e1b6430fd61e463f33f51db02 SHA-256: e1dff65a3059d05171614a14c4a42205a28edc7fba1e0d4c164e5c09002d98c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://faresaldabbous.com/uploads/files/ruzeguku.pdf In PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/da9265ab4a7cee1a5db426ed692d3762/55676914527.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dfd8c978a---13968718191.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badf271fbd4---fenixobalukiroxoguzajuf.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/gatefajapatekakubixedadod.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/gewuvejubid.pdfIn PDF document text
    • http://beliangka.com/contents//files/pekel.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/95996892730.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/tewija.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612d74c602ce1---99585389004.pdfIn PDF document text
    • http://labotinnghia.com/img/files/55838350336.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fdfe46210---waxem.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/petutumekuxodun.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160723092eebb7---durutavo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e42464179---48593056418.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ace43b7d857---39887371905.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52fe616d99---94850755482.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/17555059516.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/74969105395.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/fegipewalopakorize.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/momibadejolezegigow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=medicine+for+bee+sting+swellingPDF 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_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 17268 bytes
SHA-256: 7493daec925f8de55828ace750a716f625b2c5ac752fd5da8ea35758424d4ece
font_02_sfnt_off000130c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C8 10708 bytes
SHA-256: ebdab98d62d0d640c7dd7dadd23a4a56bbcb3ec6f59310af138425d1805539d7

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