Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba90b3a3ce4026d3…

MALICIOUS

PDF

72.8 KB Created: 2021-09-27 02:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8f0fe7b389c7f7c3c495553af70a2500 SHA-1: dd3d90f8bb54deb88c2aa6e3ee587cae3e5960c0 SHA-256: ba90b3a3ce4026d3952fce96619d48bf51f745e8632204c2331606d801d258ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to disposable hosting or compromised CMS upload directories, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://heatingboiler.ca/fck_upload/file/werukitakatemi.pdf In PDF document text
    • http://l-max.ru/userfiles/file/49030670163.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/gajima.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/67075345178.pdfIn PDF document text
    • http://gyliver.ru/files/files/dotepinidisemari.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ev7su9ppgnjn6njb5bruued4b2/95969113021.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/beroxidufonorekiwopu.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/fixejiseninujapakizipofe.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/xozopuluru.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147cee4b5030---pijidevuler.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/15568642770.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/83491700782.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/varipolekadif.pdfIn PDF document text
    • http://gardatrans.com/content/Files/47830584902.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/99531550031.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/kubuvixezeresixude.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/nirusirudabunesa.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6cec08fe190b7587a4132b7b5a258d32/7915113891.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/disenifizarok.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/matoxojonaxudigaxodot.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/wiviruxabamerigoragotazav.pdfIn PDF document text
    • http://precisao.org/files/files/nojesozuzikoxejapunotomu.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/24215915354.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/dumovavapemitoviwonalaxof.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/gazevija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=message+for+webPDF 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_off0000b7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BC 18052 bytes
SHA-256: ab1e3c53513528dcbe19966d073926b423a3b74caa51ba6e911389486b68aca4
font_01_sfnt_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 10268 bytes
SHA-256: fabacd1bbdfb65702092fab10f1393dfb41a59b03df7127ab616c657e99a67d0