Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cedb5529d229a8…

MALICIOUS

PDF

79.7 KB Created: 2021-08-13 03:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52d05bf5541b20d6d9e6333603e66267 SHA-1: 9318b20291a206b95068d224d586ea024888d250 SHA-256: c1cedb5529d229a8b14514083438b9c0b12ab0a34938e0073fbefb392bb7b767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=chicken+genetics+gizmo+worksheet+answer+key PDF link annotation
    • https://asesoriagade.com/app/webroot/files/files/44411785692.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/tavimitivigasubibiles.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/xogewawew.pdfIn PDF document text
    • http://nakatka.com/files/file/tagavafapumagiweromij.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/peditopixele.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/g1t466ajkhumv6i83enktbbp63/mitidawijobekuxifidu.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/37924318276.pdfIn PDF document text
    • http://healthywithhart.com/res/file/40125860025.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/52b958d60bf362e5dba003b95c206830/zepata.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/096647dfa240a46eace1d166ed09e520/batatenotubigedojawexezax.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/94188208886.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c36004bf---97227065190.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91f56116a2---7524607284.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9jefleknqrn17jj0c3ngh92mj0/dilawakemanowulujuk.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/fb079cc15e8245b3c7ab29d9146d8471/23146002879.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/bijuluwalisimamabisu.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/xufusawozonefatipawimev.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/pawonerenuwuzuzisidomodat.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c07dbac7---wedapebopuzod.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1f0e508449f15a60326acee6ee8fa51d/medisifudurazomi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0964700a0---tizavabifefepojuloja.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/bopigonizor.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611280ba79700---97673632729.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/60581003856.pdfIn PDF document text
    • http://kelvista.lt/images/files/zagofujama.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_off0000d350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 11012 bytes
SHA-256: bc0c7e9ff7641c175cf107675b9b3c83ce852554bc44732770786d1cfcf7cd81
font_01_sfnt_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 17108 bytes
SHA-256: b49e8369218c6d5011f5940e0a5728a0d7ca97ed06b125ca32cd2f9919834f49