Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b99cb6e06debe7…

MALICIOUS

PDF

64.4 KB Created: 2021-06-21 06:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0505f2ffa2e70a6e4d267daaf6352e9d SHA-1: 435ae30894d8746fb09ef78a2bc28b8d3d1a8cb5 SHA-256: 49b99cb6e06debe73d8f0199744bc710b1aae3245a7b2903e82e124b23789b1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing attempt. The presence of a URL with "snake+io+hack+apk" in the query parameter indicates a lure to attract users interested in game hacks. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=snake+io+hack+apk
    • http://piqiso.ru/userfiles/file/jitusajorasibiwogo.pdf
    • https://spacio.hk/attachment/file/60667196077.pdf
    • http://canxetaianhduc.com/images/file/47725852874.pdf
    • http://arslanemlak.come/file/13125928837.pdf
    • http://drjoecarver.com/clients/49355/File/ripotuwirigidufi.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb5807680c---26057313831.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcc94a7cad---22876302735.pdf
    • http://debeleven.net/UserFiles/File/877639305.pdf
    • https://hansenlight.com/UploadFile/files/kamoxipexi.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e7c62613---nufapewezomebopazirasi.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/qnhp8cfb6rrfqeutad5ljk12mt/mogemu.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sikel.pdf
    • https://fonixkoncert.hu/upload/file/73181519074.pdf
    • https://fajanav.com/aym_image/files/503260275.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/51e2a75e93b595c6cd445609d85f1896/roleja.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b442.bin
6321edbedb9b53270d8ae7e16d331e8d6d04431cd22d50dfeb8c80dd244199eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB442 4880 bytes
font_01_sfnt_off0000c4e2.bin
748dc2d7b8b68a1c588f2841a67ae1bb7d047dd074bd86ef619efdbee5c2b7cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E2 20632 bytes

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