Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da9cb40a52f572d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 01:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: abd7000b229e81e6351cd7e31f39e7ae SHA-1: 14cdfa204792bf4c1c2e62ccbe783032dcbc5e75 SHA-256: 4da9cb40a52f572d82700fbe5ea52b83245d8e246816c65bc3ca11ebec43d309
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code, potentially to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tahitotfaluovodak.hu/ckfinder/userfiles/files/rubobuzarefixa.pdf In PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/26959927250.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/wedekilurixugimijepa.pdfIn PDF document text
    • http://farashimirooz.com/files/rifopisazigirakosijakixiz.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/69495498645.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff0b59912---20620204238.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/d5ahm6t1qq6euqelp303aitgvm/59098882693.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ffsk76jv4hf94vnogq0enf9m62/62259427373.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/5909081291.pdfIn PDF document text
    • http://benly-carson.com/product/files/14955963520.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/dobodarogatazexikunalu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b811e09bbcc---ketebajuvolif.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/18672431683.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c340538a91d---busufegewisowogifim.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a696224383---badilol.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/nibure.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/8lci4ghr002uao3dtgni39m0f6/sekagulora.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/rilojomolumufomanomezezi.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/tegexe.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/58e78e6a58d9d59ca818d5c44bd3b4f5/sugetizeximepupezukur.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/42174956614.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/ziwujemugiz.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/banokopegujo.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/31240752303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=psicoterapia+cognitiva+pdfPDF 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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 10816 bytes
SHA-256: abf05c59dae722480bb2313b3162865e950c494450bb68766b1d9dfdd8715339
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 18720 bytes
SHA-256: e948dcbfcc4183cd2a9a3acf9098e0b610fd5beddd1d64940be7d7209b1f9b1c
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1