Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb90bc86bbda115…

MALICIOUS

PDF

88.1 KB Created: 2021-08-09 22:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: be156ba4a9a8b06326c2be720038f5ce SHA-1: b6be661169aafcbaa8be5ae80aae37ca8a8806f6 SHA-256: dbb90bc86bbda11517a4bf1f084f05d7fbcef51917aa28fb7942229735e8737a
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised WordPress upload directories, suggesting a link farm or redirection tactic. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content likely attempts to trick users into changing payment details. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or credential-harvesting document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://tivatijapan.com/uploads/userfiles/file/belitetadaxerupaz.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/waxoj.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/56355392104.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160702ce9af9cb---2783124909.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/d6f1b1294389b12de9725aadeb8d63cf/18612028197.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4045cd27a266d9a97dcbb70200b0b08e/47521053049.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa9dadd06---fobedizaje.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/miwutomimu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d8620169e5a2d289a9d0b4250c48ee79/65143738220.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/71162847733.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f590755c89f---kavegosekuge.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/pubefokinu.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/7897456118.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/fugixudadal.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/nafaw.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/remoz.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/ripoxasufo.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/gabusaxa.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/momevukazakemi.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/16693504601.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/wowid.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210602133708.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919913a675e---najipogemotukifovemusibu.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b71932f1b---93182809850.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/73bdead2072e9e80d5c76cd109b89bcb/lijerido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cats+the+movie+taylor+swift+songPDF 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_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 10956 bytes
SHA-256: 23d268767a9f80b9baa9f31116d72b5e6768718023aad06195a4b9febe165b82
font_01_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 17944 bytes
SHA-256: 9894dcca31d6cb5e456532e7b491bdd423ee7d791a1c6f817dfc43c272c3de62

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