Malicious PDF — malware analysis report

Static analysis result for SHA-256 d862dc81b2f161f3…

MALICIOUS

PDF

72.1 KB Created: 2021-09-24 05:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: daafb9efee6d0a1e721a972b700be05d SHA-1: b6d814927f1cff57aee2c0904b78ee04076afbd6 SHA-256: d862dc81b2f161f300b887ff384b6b1caa3f06d61f7c3f3de7400c91dc54981b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution tactics. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://allytemp.ru/uplcv?utm_term=delete+file+android+programmatically PDF link annotation
    • http://vindindex.nl/images/uploads/bomanejaxonuferelodili.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/nuxokojivobotugemulofifi.pdfIn PDF document text
    • http://moneymaker-gold.de/files/94128259488.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425352b92e5---74521646331.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-5/20210905013210240008.pdfIn PDF document text
    • http://tayles.com/uploaded/poweluruv.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/duwerolezakog.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/newese.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/kewufiwiwinowaroxonazi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614722d3a1ca8---98891745176.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/fatok.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/kutigaliretotutasoma.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/68208856220.pdfIn PDF document text
    • http://datcat.vn/2018/file/4496713654.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/86448695260.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/mepim.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/37291772680.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/mizurelufukuk.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210904071520.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/kuguwevexezofasejox.pdfIn PDF document text
    • http://iucecb.com/files/file/wezopif.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/malusinunoluk.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/25888661705.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d9095f5d6---xurolig.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/rudaxakexikiponadixetev.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/gajulo.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/somotasumeredemabebe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85F 15936 bytes
SHA-256: 196eca02564a42fa42e8916f626e836efa80f8de8a7652b023a7f63ec9ca824b
font_01_sfnt_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 10912 bytes
SHA-256: 6df5fa594970bfb4dc57c47eb6360ab775f1a8cb2df7eccc8435c350c2b19251
font_02_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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