Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa7f358b7c76684…

MALICIOUS

PDF

172.4 KB Created: 2021-07-14 05:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 64927f3081af4e6398a49cf0d7856a49 SHA-1: 30ea56f7b3913c3af6b0dac2582268326fb7a6fc SHA-256: afa7f358b7c766843ca853283d96939ff0d5acc13f06a947dd52bdb2bc89a6a7
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous external URIs, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=electric+machinery+fitzgerald+6th+edition+solution+pdf PDF link annotation
    • http://greenworx.eu/images/uploads/files/pigiwameromevikire.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/vexitopagag.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/39633aadcf4eeea87bb829c053255370/jigezepekikuxufij.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/4980367082.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/mukases.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/38910107544.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160886eb78de41---21928559223.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/783966534b5cdc2a2fa2cfcfc0ded106/wadabip.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cb8779f7cc278ada86b692f4e8b03c56/42445459141.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/pvnfus1sjlabta353cbu543mvo/munurixomi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2d214b7a9---71095553899.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/bevakofibalazevagagozovo.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/42phfurd8novpdg3dpsjdi7qp5/57831238931.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa007f3461---34065724196.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/bekarixalod.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e089d97e2c2---tudituwoxegevolunaz.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fbddeedd4---kuripotofakevukopij.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/telajewitototoludosene.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffd4a3d6a---12862462910.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/favinumunekijukawikelajod.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b9a3f40b---ninexilerisuwidotowa.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/718260043b134daa45ab2e3196f4f76c/babagibojivezeguwifetaduf.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d95fbe1e5cd6e42922b698a3a2fee942/beramexumepujiwunirozu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001e7f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1E7F0 24328 bytes
SHA-256: e1cea831a874f2184e274a4d76905447a2cf94f661810e6b952de92c715a5b3b
font_01_sfnt_off0002126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2126A 28292 bytes
SHA-256: 67dcd5c3ada1841326849514cc62335b5a31baa4def747d61ec527a34cac8e17
font_02_sfnt_off00025754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00026f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26F61 7060 bytes
SHA-256: 24de09202aeae940031b243a121d9113fd760c810f737a5c5b507b65f6ac9f2c
font_04_sfnt_off0002875e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2875E 11492 bytes
SHA-256: bd5336295192f5f6ce6cdde997054b2401fe743bc2e8c599352fb37aa38be0ce

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