Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16898ce628b4421…

MALICIOUS

PDF

69.7 KB Created: 2021-10-03 12:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 13625111c316b5c70fd9ab328a31b1cf SHA-1: 37265e4b6b2bea01bfbd2dcb996d1abdd38aa52a SHA-256: c16898ce628b4421a6e7980442333bcc00d9c9001b36c08158893ecbeef39cfa
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by a machine learning classifier as malicious. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites hosting other PDF files. These links likely serve to obscure the ultimate destination and evade detection, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=how+to+make+silage+on+farming+simulator+19 PDF link annotation
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158880c7207b---nijovomogasuxukam.pdfIn PDF document text
    • http://only-svet.ru/upload/files/15785469958.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/65904969028.pdfIn PDF document text
    • http://centronegozi.com/public/95117910723.pdfIn PDF document text
    • http://citlak.de/admin/UserFiles/file/dinewefudolabafasesisap.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/posaxaridalokifaxoguv.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/28838524060.pdfIn PDF document text
    • http://demkapi.com/resimler/files/vutitoniraviwulaju.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/19404098997.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/vutofuwarupil.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/kofupokiduzuri.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/63761053915.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/muwetebufexenurapamido.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/nuwadonos.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9n6v2aup4caajputqe5sq1rkr6/77624361325.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615213e72be8f---68447051197.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613100fa1aa01---90224008711.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/mutovomeguvabozunomunoxam.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/xurizavoxaravonevenab.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/dodesemikenininojofe.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161496150254e9---dukujeve.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/kipiwizojavixulaxoporunu.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/paxapuvegojowanetedis.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_off0000b234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB234 14632 bytes
SHA-256: 60d7354f3e39c7e654a85508882e03db2758ed6721565ca615197999e8eff09c
font_01_sfnt_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 11048 bytes
SHA-256: 640e5b63fe52fcba82abbab075ec12afa074e78e95107bee22de61fe0f11711a

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