Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffadd865cccebb17…

MALICIOUS

PDF

94.6 KB Created: 2021-07-24 03:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7616755a656bbe86fca0c1c84abf788 SHA-1: ac83eb9006c6b3bbdadb8e8a976f02b8c7e1fae3 SHA-256: ffadd865cccebb17b71537e44a7559c79674784a534ae21deea8ddaad97e3245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. Although no scripts were explicitly extracted, the nature of the links and the detection name imply an intent to redirect users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cd942e95a---88988748004.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098f88b9c016---xozajatekaduto.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d574430dcc57a093d57a70fc71cafcd8/49518637393.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/42149912764.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5a10f83dc52d530bce2ec36c5cea5c91/wuvoxevu.pdf
    • http://agapetown.net/ckfinder/userfiles/files/64459599070.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb4331b33---11673099923.pdf
    • http://bjaimama.com/data/upload/2021/05/file/202105250131314139.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b34bbd7e8781dec07d6455d6e85cb61f/73197724889.pdf
    • https://echipamente-scule.ro/userfiles/file/55991637281.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/807713adb72e07189e8dea02ebfec636/66186762224.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073ff45aa3e8---26920514155.pdf
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/rigedofapimoxiba.pdf
    • http://sns-russia.ru/userfiles/file/7402825769.pdf
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/26244953848.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/851c1db8260dd527ca5cb77345263f12/62484174359.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608360fd76980---39634879553.pdf
    • http://dejede.com/userfiles/file/73305088757.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da54dd3ef6f---nopabutimupizegej.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16090558a87a80---9467342018.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/3kuatchhcvt4js8nc2ue6q7cd9/pisegeposen.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc60f9c3ee---fages.pdf
    • https://zivotzaokny.eu/res/file/zeboje.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfcd7aeb0---77571945812.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=como+calcular+numeros+cuanticos
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f281.bin
9806c8f8dc377a056649b3b570059c49974d430e24802ef2d6c2b0fec8d5759f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 19788 bytes
font_01_sfnt_off0001260e.bin
1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 16168 bytes
font_02_sfnt_off00013baa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 16792 bytes
font_03_sfnt_off000153c1.bin
04f1213624ce0562e1612c315ed1e0021d8bd5270477dfb1920abb1bb2d1698a
pdf-font-stream PDF embedded font (sfnt) at offset 0x153C1 10520 bytes