Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2483863d3477013…

MALICIOUS

PDF

79.1 KB Created: 2021-08-14 06:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d2666e1734df53189ccf2292ad8b610 SHA-1: 69ba79ba52024a7e3e4251fe5267ea987583ce95 SHA-256: a2483863d3477013bd0e5ddda2955a5d83b074c4a7435c1d9749dc57e981e625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://maychamsocda.vn/images/userfiles/file/buxop.pdf In PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/41599984381.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/25eec228554f8c5e9136737ced5cf15f/47946902951.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/40730120048.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-23-22-59-33-51.pdfIn PDF document text
    • https://spacio.hk/attachment/file/69138153153.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/vosux.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/2812177276.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/moxadabosavewoje.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/39387257736.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4f30939845e9dee4db1b98e219e4a4bf/63485387021.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/jiwubirifisejujimi.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/xujazamosa.pdfIn PDF document text
    • http://cl-pub.com/files/files/67709389906.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/wixudesowuzalefemore.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/20cef12883d65f5d4de669dde5fef216/suxago.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/zonov.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/1270786043.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2cdb37ef3---78722273625.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210626032216.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/37144201564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=chip+on+your+shoulder+meaning+with+examplePDF 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_off0000d107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD107 11272 bytes
SHA-256: 7fc7131251cf1bad25f2e1264f6c95f76c693786d828fae604c602ca23d05245
font_01_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 16728 bytes
SHA-256: 2a8c40b7b9fddf6ebdff310addac0cd0d5a3f0c39ecdec4735667ee36111d903
font_02_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1