Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b00815dd466bb7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 10:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bba7420921b0042f0d7f732ecb8ce7b7 SHA-1: da02f22a1f0f642507e135a3e05eafe399a7d0ed SHA-256: f5b00815dd466bb72be06b04d7b51d83470b8ffbb421045462f9672f58a53c3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No specific family could be identified.

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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8d3f88292a7d7199f2e832f87c58550b/49975116826.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/444012189.pdf
    • https://minervatech.work/js/ckfinder/userfiles/files/99593439989.pdf
    • https://samavetpharm.com/userfiles/files/20036905222.pdf
    • http://thesciencenetwork.org/uploads/files/79409830776.pdf
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/nitefepu.pdf
    • https://cryptobasics.biz/uploads/files/81288341939.pdf
    • https://hashtag.school/userfiles/file/54463232395.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd47225546---betanixanagegenogosev.pdf
    • http://studio-castiglioni.com/userfiles/files/tixepuxamojezusezix.pdf
    • http://sieuthibds.net/images/files/11175245522.pdf
    • http://naturalfurnish.com/userfiles/file/71324406220.pdf
    • http://tainanrup.longi.tw/uploadfiles/files/20210909_213443_3664.pdf
    • http://ballmillfactory.com/d/files/savodizeluveninabit.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bfd972a2816d8c87d078b53c2a24ef8/94983396106.pdf
    • http://castel.lu/userfiles/files/33661631962.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/bojalar.pdf
    • https://stepweystudy.com/ckfinder/userfiles/files/80630178162.pdf
    • http://www.ufolep-69.com/contenus/files/83285511174.pdf
    • https://wspaperbag.com/userfiles/file/gazejud.pdf
    • http://change4best.ru/upload/file/29346262703.pdf
    • https://edusfera.pl/upload/file/nuvumodadujikasix.pdf
    • http://hightopeducation.com/cms_uploaded/file/dolakilovebi.pdf
    • http://abovomedia.hu/_user/file/27844819580.pdf
    • http://dreambeauty.kr/upload/fckeditor/file/wumegijavatena.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+disease+disappear+pdf+free
    • 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_off0000d8c4.bin
3ffd5d38e6d77e51e50b9d5832f7ff0a85ebdb0cdd4706b0990bd6983a60d8ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 18972 bytes
font_01_sfnt_off0001099d.bin
9e322578963430789114e52fd605320b0a81c6103a784aad4d7c275a91223da8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 10680 bytes
font_02_sfnt_off00012229.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 16792 bytes