Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf0bf83e63e8413…

MALICIOUS

PDF

88.4 KB Created: 2021-09-22 17:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c560690a50a5eef8b9831c48f3f09bcb SHA-1: 6db4d5dbaad262c6e701ec5d0d0fb0cad7d5fff3 SHA-256: 8bf0bf83e63e84135aef63f4ca5c8c2f5dd9d0e3e7605c0ca4d377dacb24f1e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external links, many pointing to potentially compromised or disposable hosting, further indicates a phishing or malware distribution attempt. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.sudeshnamaulik.com/fckimages/file/viregusiwefapizepamisulum.pdf In PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109210712334009.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/wavalozabukukifid.pdfIn PDF document text
    • http://steinemann-ag.ru/sevurimodazowedejij.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/92101111160.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/buwinuwevuxanabemerigupo.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/32404731742.pdfIn PDF document text
    • https://funke.be/data/file/52621688873.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f940b797495c91bfab413e99845f1361/67396486604.pdfIn PDF document text
    • http://cnfgl.netsociality.com/upload/files/19137418579.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/rejixirijovopinepudi.pdfIn PDF document text
    • http://zimmerei-possert.at/19578735275.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/mafawim.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/kanaxolinegixejigumav.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/xumojupive.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/valalugujumodi.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/taxokulugudisiluzevoj.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485abe9299d---wonepobojomixekuxazodus.pdfIn PDF document text
    • http://aprt1day.ru/file/50247994087.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/mekejibexesawovi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/u21t679t029bopc7nfhh1lekt7/4118858535.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/68456329716.pdfIn PDF document text
    • http://sparkpro.lv/content/file/belotomen.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/nagefosijulixetudodagumus.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/12585959163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=stop+android+pop+upsPDF 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_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 18408 bytes
SHA-256: 4a9b54b953f293371c830be6551c6b070ac598f0ff8fd81915fe4f533cdf1355
font_02_sfnt_off00013d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D81 10380 bytes
SHA-256: fb04eb4f81e53da0ae0688311ceeba881925b4c6896df463c9430fe160baebfa

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