Malicious PDF — malware analysis report

Static analysis result for SHA-256 25156373cce1c0cb…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 20:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee9acf133f7a26515102ba43c1ac7738 SHA-1: 4f22e22742bdb22e1e6f01baa18fd4908e9a3efd SHA-256: 25156373cce1c0cbd6b50fe45671c5c20e69e967b5fb34839c32d109dd78ecb2
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 WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://aeronautike.com/userfiles/file/kikitofofezakebap.pdf
    • http://aj-logistics.com/stock/userfiles/file/78378897230.pdf
    • http://heibldr.hu/FCKfeltoltott/file/kusemitanebulowubelevavur.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zeragi.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713fc31db44---73696888886.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/bf54c5b16340a6c27a46a636abc12528/putilegidujovasivokadigap.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/51ubm0o04eupnnhkhn0m3v9j80/89501213054.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729e4d6e3d2---92695661817.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3720d773f84afcb5e488de77a941ca79/94509826313.pdf
    • https://soudurelauziere.com/upload/editor/file/7851233729.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ah151juub2353b8fi99temr2g3/doxigoluw.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cf471fdca---57783367333.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/kavedutokewepofipusixig.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/d41fad025fb2c2a419ac33f05c4e83f4/56114137512.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/0d153c76cc01258e1c8899fbfcc660a4/janivupuwek.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b555e5cadd8---pabomisemefon.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ll0kf6u9vm51n912aid60d8iec/13857961591.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/i7pp54ssu03ulcl8llknae9fml/33991355177.pdf
    • http://coyada.com/up_images/up_images/74746258453.pdf
    • http://1utilaje.ro/mm/file/litinasokuwuvuxevewogaf.pdf
    • http://kmkonsult.cz/userfiles/file/64309556016.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=black+owned+braiding+salons+near+me
    • 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_off0000ec36.bin
bbcf07624bf15e3c8e06fcfbc4f3949dfe59147384fdea1733a0b75ff385357c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 17596 bytes
font_01_sfnt_off00011a5b.bin
23406ccdc557025b246829d07d83da98a0d4de39183ba7d6dc2fb1bae5a050b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5B 10988 bytes
font_02_sfnt_off000133b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133B4 16792 bytes