Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fd6d084d5eae5f…

MALICIOUS

PDF

74.9 KB Created: 2021-08-03 21:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 684208f68b61ba4f40f55944473f3d8b SHA-1: 6d9d69820fba23bea049b08000a36fcd2e7d7f95 SHA-256: 51fd6d084d5eae5fcc442070ba71b743ee8631af4a3d95a0ce6ef2a90735d40b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URI and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mayxaydungthienlong.com/uploads/files/files/maxubakipijesi.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5a101f3b80f534b7b74cf179be600139/89385077492.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/5654851948.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/20166446835.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xaxigonixosuxufupoba.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/89584478407.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/1727c0085d45016ccf27f189e8c65348/72491866923.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/xevidatuxejeja.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/guraguvur.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/93634951263.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/kaxadipakosuvavil.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/50047680724.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210729_133551.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de3bb49c99---16033486725.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a08dbe77d054a6ba0d23919bae16604b/kejifuripadamuvujememoguj.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb2e284ad3---95088975196.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c34cs1sm5brccaeolksdvug2c/78454157205.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988d517a8e7---vewewofujalamododivewibul.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/f46518d3a180fbb3117df48c46a0d867/foxikelorobubotoxewep.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/963168059.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8569946437e03eb5c81071b6a9552b85/buwidafeligulove.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/69040610686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cool+maker+bracelet+patternsPDF 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_off0000c2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 16520 bytes
SHA-256: 7e1c76143243b5fb08573dfd330e90963e941d88cf4078e189b92ebaa74bbe6a
font_02_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 10708 bytes
SHA-256: 50252e8df5d1704ca81c4c06164315f19bbb1de01a9519ecc3770f9f688a26d7

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