Malicious PDF — malware analysis report

Static analysis result for SHA-256 9759a186977da57f…

MALICIOUS

PDF

85.8 KB Created: 2021-07-20 11:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53a38b94003285c4d141aad3c3ec9fb7 SHA-1: 56581a0977354ce1b8ec660dd9690db7b13edfef SHA-256: 9759a186977da57f14a0ae15f6115585e2ff60915af7fccd6275e19f39a023d4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier strongly flagged this PDF as malicious, and the heuristic rules confirm its nature as a link farm hosted on potentially disposable or compromised domains. No scripts were extracted, but the structure suggests a malicious document intended for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad23b457faf---gadujowelefuboxat.pdf In PDF document text
    • http://kbchina.de/upload/tofidokozi.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/132600703160a656f8d3fc8.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/33775922191.pdfIn PDF document text
    • http://candientushinko.com/images/file/wuvevixado.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/69024476025.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/4e45945c64f0e648fa98a392e30a867b/zusixidom.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/dokag.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/78d3f559101804a2ea833a2241a055e2/gemedoxebodap.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607748591ff60---66580692904.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/234f3dd12896acd694d62f389585ae8e/45301964638.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/9062288018.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011723201476.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b0a435c1e---wapepezifekonirukojolil.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/398f627ed1b2e6fa44c98f916b7875ff/73561471562.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ln5enprpel7ackq5vooe7knd2l/63000301012.pdfIn PDF document text
    • https://ecoretras.com/file/tipewunugaladixafel.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9245cd7f7---lowolobekodaxolot.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/400938364c080428723cfe49555a7a92/15838268092.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/j6invkndcl1jhbra5j94pv9263/20326356101.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/218f2506880031ac81206f1e3edf1ccb/61521558951.pdfIn PDF document text
    • https://amblamy.ee/upload/file/sowobutobupidapukuw.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/01e9309b86030a3574ef668e54164b33/79657567072.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d809be58bad---mizukus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=can+you+use+automatic+transmission+fluid+in+a+manualPDF 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_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 17984 bytes
SHA-256: 43a00e957896d9891d9451e8df9ecd36bee4637762ca9350e82ff8c46838135e
font_01_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 10884 bytes
SHA-256: 133285eda29c0938eccc38f7f763905e5ed7baf8204a17158440d2ad0bad63b4
font_02_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1