Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5da62d24c76ed17…

MALICIOUS

PDF

88.3 KB Created: 2021-08-09 09:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0fa54108a4cdaecbda623fc2c0464c0 SHA-1: 78285433d31aa312d611c39e15ed71aa60f31480 SHA-256: a5da62d24c76ed17df053ff4b9a147d295d435eae048361d89da6b15e720a084
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alihuata.com/userfiles/file/xasumekozozup.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/89614771226.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/e522a63d3e83d3600a8a444e4c1f74b7/zususedomozukupugipuwufiv.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/388448721da69667c9ac00ebe10abd92/rikonajosenupejo.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/87c2ad06267691f31f99536d88230561/buvizasinalikujo.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610a306f9999a---72100482086.pdf
    • http://divyabodhanam.org/userfiles/file/mulisas.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8bb2e51b---82598803763.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91b555917---25741081862.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/128980b74c13c58208eab90c7056ec79/tugozarut.pdf
    • http://www.prodomasa.com/ckfinder/userfiles/files/bawosaxavagapatuku.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0230caf67---zedanuliwofeposikoxabexu.pdf
    • https://drivetripper.com/userfiles2020/files/sexesi.pdf
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/labaweporuw.pdf
    • http://china-hold.com/UploadFile/file/20210724065937092.pdf
    • https://kaptenhoki.com/contents//files/5221479383.pdf
    • http://honghuibio.com/d/files/86749804724.pdf
    • https://artlabjo.com/userfiles/file/lifedasowugisilaxekiz.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4e2007da---bamibanu.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/ced8589ee2d4e61f221c80722f300068/81924815400.pdf
    • http://fly.no1-yes.com/userfiles/file/91754364491.pdf
    • http://oletrans.sk/editor_uploads/files/konofalabevaga.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=job+handover+template+excel+example
    • 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_off0000f401.bin
efa5f483c9cdf857aa078cd2d5d48a1d0f8bd05a7cc8d402940530ebdf9727dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 17304 bytes
font_01_sfnt_off0001216b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 16792 bytes
font_02_sfnt_off00013982.bin
d431837ba3067a26cd8fe6b18b531811fb0b1f08e646a280684c0d26d2ca9e5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13982 10820 bytes