Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bfdf782cbdad11…

MALICIOUS

PDF

84.7 KB Created: 2021-07-16 08:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e68bfb26ce0672c612baeef9210e56a9 SHA-1: 336212be34315c4fbf8e7f6e650039b81e3cfc9e SHA-256: 68bfdf782cbdad11e6466a0ae89940ada8eec783e1cc1fd80b339f94258777cc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://fusheng-vietnam.vn/admin/webroot/upload/image/files/zowanaxitoxobiniduromoko.pdf In PDF document text
    • https://anakaygame.com/calisma2/files/uploads/2891343671.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd62226995---dufesug.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/86040459310.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/51032532805.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4efb61c8f---golaworaj.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/30096467562.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/fedomolupolisusixuji.pdfIn PDF document text
    • https://preciseenergygroup.com/media/36270627866.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/v37gfnjedo3k4d40bru6f9l221/bebenujepaz.pdfIn PDF document text
    • http://coffee33.ru/archive/file/58467473267.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/d7lt8n2gbfivvvt1h5cmtqu2t7/29280935156.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/pomevesaperixajotu.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/lizazokesadav.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/p1i6nolcmng5ahc6jeoeqvs4k6/10203105912.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/seguwakuxuzagisajum.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/bijevijij.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7371441bd---vowexenejevu.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/n103tcugtoudj4irrf0ucnk6pc/merusokuxamituxim.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ac54d880aea301ff4c23e487f52e5ac5/xasatejobeja.pdfIn PDF document text
    • https://parfumzone.ro/files/file/vizibifup.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/nazux.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd687cf1a90---23413342461.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/woxenopoxugobaxamolisej.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/tavepabupugaxojasafaperor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dinnerly+this+weekPDF 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_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 16988 bytes
SHA-256: aa26bc8557448223217b0c6481c38dc8ed5e256ec009671d5346cef98d01341f
font_01_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 10216 bytes
SHA-256: 941cc024e9d0bbf72c815a33f7cae6cf90e1b08a6f3c8fb1e6a6dd8688c68ebf
font_02_sfnt_off00012dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1