Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8518de486f0c6e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 01:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a85c40882244df1ad0e1ffde5689da58 SHA-1: 8e0ff6c382b12ce263ef3df99d9c0b57d61104ba SHA-256: 0d8518de486f0c6e9dd5d90e7697ed3417f7504be87c8afcdb0c024ff228ea3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading further malicious content. The presence of external URIs and a link farm indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dobre-akce.cz/media/files/file/37867578793.pdf In PDF document text
    • https://izometal.net/mm/file/14853281086.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5954b4329a3a6be358b05b762d25fdec/90796272187.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/19326287022.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141edd2a39e6---magojupuzokuzolozivovesi.pdfIn PDF document text
    • https://coil.hk/upload/files/54154928520.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/muxodidaxoxuwijaf.pdfIn PDF document text
    • http://chikatere.com/Upload/files/1833567549.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/vuxujatozapamube.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/88398277368.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/woxozavovi.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/vatibeguso.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/39295187751.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/tagesulovolezakelodonafu.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/42197079728.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614017f60d722---safonevimozopekodusoduku.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/abc66542af07f1159f0112a2501189eb/forojaseloze.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/rapafoze.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/1af1bd4233d62f3d5d85df4b5d5b44aa/zifegubatogela.pdfIn PDF document text
    • http://rsst77.ru/upload/files/67686190702.pdfIn PDF document text
    • http://chipgene.com/image/files/20210908_055847.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/rogimunitilovola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chrome+os+download+for+pc+32+bitPDF link annotation
    • 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_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 11436 bytes
SHA-256: 27b255a517cc9817a47a4d00bb4f79b00671369c43aa82d93f6619d9a466b80a
font_02_sfnt_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 18908 bytes
SHA-256: 66b4dae203fcb89184f9cf805d00a5570093bf10c76831488692697b8f821fb6

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