Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef9f9fa9fa00525…

MALICIOUS

PDF

95.3 KB Created: 2021-07-07 19:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bb20f284ade8cbcd1b2041a8d8d1c437 SHA-1: 994b056aa11869204f9c3aca2100723cfb6901ef SHA-256: bef9f9fa9fa00525917ca34254db1641fe14cce71d70cadecf64cfe645c85828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting, further supporting a malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/170052ba09829d87a68242d97bc0700f/26229417636.pdf In PDF document text
    • http://mini-garden.ru/userfiles/file/18839570470.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f49d0d6e0---73668083539.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/27795935122.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54c7b28b03---nejikalivonekat.pdfIn PDF document text
    • http://pk.mo/userfiles/file/79684395324.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/pcm9ed02k8vkoo2c5n3n2m0840/biroraxegulejoruni.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a907e812bd0c965fba33d56ed47e9171/56880331247.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/90777534718.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607355d2e66d2---lotuzigifejiliga.pdfIn PDF document text
    • http://fitviewer.biz/files/file/silulirodigalinixumonu.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/64158001139.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/gumemagutegonajumawemes.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3fa1a13d22ae13c49d08d4a56a6ba1e2/mikaputafuj.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/84447479366.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/rufabugu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fcb927986---mibabobinonibu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210627155208460.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/hiktsfmivntdibolpreamm99ok/39746152410.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d1b276ad---fadapozakisuziwalenubika.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/920eb0eca74c2e3edf33a5f3bf90ebbc/81548707897.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/famiduduwakopukugasadi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vufajunekidigam.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16233465031926119450.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/votopevoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=definition+of+requisitePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 21740 bytes
SHA-256: 9b53af8c610e76ba1fca9a537177f8ccc78e146b26cd2c8e48ed660ac7928ddf
font_01_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 2428 bytes
SHA-256: bb2ffeb0dbb7a5bb0f0584cd5d8a6a5f66d6df1332dae9f4ab4fc768b375f345
font_03_sfnt_off00013f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F24 16484 bytes
SHA-256: b71a200d3cac636abaca7cb8bf675471e07045ab93b277ab79f12e9205f51c0c
font_04_sfnt_off00015623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15623 10244 bytes
SHA-256: c70e6daeaa68cc4934da4fffb003e35c762346a4c32c1b821c518c6f4e40a11a

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