Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5ccd9eb4771959…

MALICIOUS

PDF

73.8 KB Created: 2021-06-29 06:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d678e52bb9e2f6553b49f9642068f88 SHA-1: 2c45794751a118142d686e77f72e272efb457656 SHA-256: 9d5ccd9eb4771959b407033776bcd09548d3dbafb9620076b4be5144b0b01aed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs and the heuristic firings point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://inwebjor.ru/uplcv?utm_term=computer+and+networking+pdf
    • http://msslink.ru/userfiles/files/dojikonebofixagubufukilun.pdf
    • http://abwplazaview.com/uploads/files/soninekajuvopenuriguda.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22a55b39af---kuwerepi.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0340c6f36c83ce8d9edbd6c4185793a7/fuzewirup.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084bb1c0c788---79611126004.pdf
    • http://yanartextil.com/firma/files/2347381438.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/41399501962.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/0201021643a64bb156e2c4e0bc46ead4/bijepenimakopeg.pdf
    • https://nadinerogger.ch/userfiles/files/35168726740.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3eq0qn1r8uoq1n1rs6chjssvn0/33333112893.pdf
    • https://alice-immo.com/userfiles/file/suxolaxakifo.pdf
    • http://oilmachineydy.com/d/files/pejuj.pdf
    • http://smclassof57.org/clients/34860/File/72413769856.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b04ba7f82---rutuwibamawebo.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce0ed5d27---35552811762.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d9895bae0f7a405930e52a39e424439d/zizadokuzagel.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b8dd7ce6c830099b0a616e3ff5d12cd1/87153654466.pdf
    • https://csodamalom.hu/files/files/wuwepuzefidorumezu.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/fa8e48ecab63452e2809b6a08abe2f5a/voviwatolezorusuzowides.pdf
    • http://varanini.pl/userfiles/file/1960743863.pdf
    • http://elitvorota.ru/f/file/75607444310.pdf
    • https://atlastoursntravels.com/userfiles/file/48443829748.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2917561c30---wolakirotagawupolexexor.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/eaf0992ddee46801b0ad19aab671064a/xulogubalosepux.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ba29ab43a0cab5184300c64e0e40f5ad/rubutodelumajubotufati.pdf
    • 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_off0000bf74.bin
6aa6ae1bb1cfc10f2f477bacb81b5dd565bcf4a10526d51e8e621ba36be8485e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF74 15920 bytes
font_01_sfnt_off0000e871.bin
14d07de8c60493a5b5666c2e77c947c8ffa814d3451c5e30adbe36d4292f4561
pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 10936 bytes
font_02_sfnt_off000101a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 16792 bytes