Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cbb58e6058595a…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 17:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e72d0c7cc95fadad72a598948514a92d SHA-1: 12b3952fc61e41177eee793aae35268065d0e546 SHA-256: 26cbb58e6058595a98fec1d466ff30ad74bd4b626089ac1a0fe7f210c709e5da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://infrive.ru/uplcv?utm_term=subject+verb+agreement+rules+with+examples+pdf PDF link annotation
    • http://alnadaoil.com/userfiles/file/xotugisiwamefagozij.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202108212133183448.pdfIn PDF document text
    • http://indel.sk/userfiles/file/27698961613.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/16234070286.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/81831640667.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/44363482063.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806162684ce---xerazeforemafux.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/zikofiwezezesudodesupagek.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/doxapefosipetifumose.pdfIn PDF document text
    • http://rideco.hu/upload/file/20861551876.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/77790321723.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/tuposifezemagajije.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/pigalunimigeguxogelato.pdfIn PDF document text
    • http://usagimatur.com/files/others/mafuxakasarer.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/63bba50bd5e2fa243c1a4660f2d18157/sujul.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/34344823798.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/wedorewugoxirasafaxafig.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/52747342104.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c4e233a0f6761750f6c8f8184eff6d0/95060624290.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609283719de4a---39541132489.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/d35880cf6d2bc09084d316156de802d1/42634567301.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d5fd19eb---semeguwu.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/45160174468.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/fivitolazilijolajimipisa.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba64a420154---74686040737.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a520bd68846---70504597314.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 11648 bytes
SHA-256: f72094ada9b371927db57b37795ec62e62bf68882c1fdc722c0196300bdd296d
font_01_sfnt_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A1 19508 bytes
SHA-256: 0a27dc31fb960bc8b3dd1fcb9ac9d95655eb4e808075934d9613e5a9b6e8e26e

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