Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68de4b0fcbdbafd…

MALICIOUS

PDF

88.1 KB Created: 2021-08-07 11:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 697573e7f0d64fd9857746f94ab10185 SHA-1: 26f2b0b7de2e9038f4ed3fcdccb5661e3f592c9f SHA-256: f68de4b0fcbdbafdeb1ce48c73a6d9ce5caba4312b4ebee767bb48db393644a5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lvgsl4pj6h1v6invtuqo8hqkii/56983510482.pdf In PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/29959068887.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/64069649536.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/roramafim.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/dovanojojam.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/87031736057.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/btpoalist2pfi0hp3sjfthood5/91779819070.pdfIn PDF document text
    • https://cis.ncu.edu.tw/document/files/sodajilakotomosav.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/5a02ffc13db51fe8d6aaab9fb1ea3294/36715373335.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/watipidubupijojomej.pdfIn PDF document text
    • http://imi.vc/upload/files/32654716007.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f6767f744da---99912429730.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/55034435416.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/mafap.pdfIn PDF document text
    • http://bronia.org/userfiles/file/77054719800.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/tonizilupafujitago.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/82214663561.pdfIn PDF document text
    • http://erex.hu/upload/file/21375148378.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/20837842976.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/kikutegogesabifewi.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162720614167313962958.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aa9d40e9e---10604794327.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/92281998056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=troy+bilt+pony+tiller+oil+capacityPDF 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_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 10416 bytes
SHA-256: 4f5bb2bc70fc587a7639be49c408631524228fdc6ea47ed48d1150d55a40ca08
font_01_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 18140 bytes
SHA-256: bcecad955e5a47796b04673f790d00ae6b82ae3527789436587e29aa451ab684