Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ab4195d3238aeb…

MALICIOUS

PDF

88.2 KB Created: 2021-08-22 01:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63eec0c603ea956409c5a8aee632d049 SHA-1: 7fdc227ef982b78960773bcb6429428384923f9e SHA-256: 77ab4195d3238aeb951c79b7c134e0d1782f6e39864ba26cfce78ec048e625b7
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 are part of link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=alien+shooter+cheats+iphone+deutsch PDF link annotation
    • http://hud101.vn/webroot/img/posts/files/ketijazezor.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/35778096419.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/24185490935.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c27c97777b3---ritagotopinideb.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/worowoxeworolu.pdfIn PDF document text
    • http://itfind.ru/uploads/file/debunefemogemizavaw.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/rujupakasofozekipefon.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/82858527891.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/68541953431.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/30792501728.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/gefufabuzu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ae29fe2e1ee0206c881e998afa904233/13510026567.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/70934744641.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cecfb41521f2b7b5500fd0cd313b821a/galenurovepufelopuza.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/xibilifatusubidif.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f21942b35---lunafuvof.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/88054148397.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/99487791652.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ae95b1149.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f4868c2fd---66533470671.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1edbbbf884---dukil.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/pofibinawolu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 10692 bytes
SHA-256: e561a5d8cbcb9b112e8f7db17424f02f9f367040ad91ad27f147a283c24e5743
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 18324 bytes
SHA-256: 5633161c66cb2fdd4228a781768931a6fae5ba9a77ef12f1177364864f1b3a9f
font_02_sfnt_off000122ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABF 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

Open this report in the interactive analyzer, or submit your own file for analysis.