Malicious PDF — malware analysis report

Static analysis result for SHA-256 756bbef2c8e25a9c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 16:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f6f084d779851fc11f882ea62051f5f SHA-1: 5c53c06169e6689f089274c1eed5f8042c170c82 SHA-256: 756bbef2c8e25a9caa30675265586b787d6a9c3cb9b8ba18fb294d3321d6ffff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, a common tactic for distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading malicious files, aligning with spearphishing attachment techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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://motiwalainstitutes.org/userfiles/file/30337840996.pdf
    • http://rentaruedas.com/files/others/xetaguwapepega.pdf
    • http://gtijsr.com/userfiles/file/detutetulilejawuponopa.pdf
    • https://resonanceacteurs.nl/userfiles/file/16291033732.pdf
    • http://finalbrand.cz/upload/file/tebovivij.pdf
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/37972979717.pdf
    • http://tpokebar.com/uploads/files/resitudufudu.pdf
    • http://oshcongregation.com/userfiles/file/giborezugotajudana.pdf
    • https://evrenmentese.com/upload/ckfinder/files/3431654519.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614272db6c6a8---41018896789.pdf
    • http://artediapharma.com/upload/files/meruzelixunabetijuzag.pdf
    • https://pinyardim.com/calisma2/files/uploads/junorivuvisinew.pdf
    • https://adtw1.com/ckfinder/userfiles/files/85855113377.pdf
    • http://vetcasatenovo.it/userfiles/files/ruwemumozosokolepe.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/93898891388.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/kunirinugoxokevajasimi.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/50593900130.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9a16e20d---51400221391.pdf
    • https://mkontakt.com/dat/file/73235816478.pdf
    • https://soudurelauziere.ca/upload/editor/file/20503596030.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/mipobarovutapiradilad.pdf
    • http://sangjeom.com/userfiles/file///sirifififamek.pdf
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/46260451230.pdf
    • http://csc-0411.com/userfiles/file/20210911175709_fod8v0.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/bbvh86e14qlsbd4jekn9fb5juu/58889894969.pdf
    • https://www.natursany.com/ckfinder/userfiles/files/3643524965.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cds+maths+book+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d677.bin
26539384cb7c5e2d9a5694292a561fa6ae5a9628389c9f21f01324e83ecda15d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 21148 bytes
font_01_sfnt_off00010e90.bin
334431689a5d4bfbb3a23b8bd33eb0bf52771f0001ef27f2722b7b65bf7b1299
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E90 11020 bytes
font_02_sfnt_off000127df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 16792 bytes