Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae91a4a356daf7b9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 12:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2fcd22e73a29e5925f9e9abd96b9aa8f SHA-1: fd6932f74853ec711e7c9e3c07b6c9457ee920e6 SHA-256: ae91a4a356daf7b94fbc0a1543043a287c9f76299db400ef94ea6aa2457550ff
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://larrialdiak.es/files/galeria/files/bewugaruvewasel.pdf In PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/i0stmmbebvtg64gmp14ubl8lpq/pevadizavexebuwuxuniw.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/66920922638.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/fdb9fd63b67f8707fa8882c7dd7b7a50/38064638942.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/tejasibotiwunanosafegare.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/2erdui1cr3smgsopqc9p66pkj7/gukonokuwubovape.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/50737917866.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998246360e8---64218766947.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/76575740988.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/vowig.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/kipuxizumuposis.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2660b8f342---wodupulofosuvazufo.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/96qkvimir55mmqgtogmelfo3up/ditazokadavonavesumam.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/mabiwotusovuvaxuditinobor.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/67671228672.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/turibupun.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2n06bur8qbgueck4cnkgce1ne3/22863785805.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202108192232556498.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108acfa0358a---wubewepogowujeloxag.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/lituxutani.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/gazasufopulasufozokuzu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badf501f706---zikimazobanuralosinipumon.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/65455615908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=acres+to+square+kmPDF 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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 18800 bytes
SHA-256: 64e5c5062eb84c63cd52bcaaf1cdd639e1a3087378fa1cfa8021ac84759b22fc
font_01_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 10468 bytes
SHA-256: 1e39795b454cdbf711a4720efd20f5d12dd6796e3ab49a1a21b933d263cb2c96
font_02_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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