Malicious PDF — malware analysis report

Static analysis result for SHA-256 f015c00ba8debfe9…

MALICIOUS

PDF

100.9 KB Created: 2021-09-05 19:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5cf9713cce39fb1e807c80e4e1ca6274 SHA-1: 4e29532e20c6b9841d5eab757f48f62b35a8a7ce SHA-256: f015c00ba8debfe97555ac032a4729aba61c8f54a4aa9b0c56ac3bb8b5181447
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to host malicious content or redirect users to phishing pages. The heuristic firings for link farms and compromised CMS uploads strongly suggest a malicious intent to distribute further payloads or conduct phishing operations. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a871fbfceb---xepawirajaketoj.pdf In PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/rosokowar.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c94460c0e8c---pedapukawuz.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///bafiromen.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/85478568342.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/76944692375.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/2855731463.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bbeeb484111b339e09964bdeeb2b99f3/72561986256.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/42148817892.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/v00q8qncv0d9lk8ulnheq83v9l/naxavazinuxeximiwutaf.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/42gik3s4hda9ephit91vvr7mh3/xujufurobadivowotad.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/pugebudosurufiz.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ac06372cfd175e57e84b718647f78617/13684591584.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/aht5qo5ggetvfksbsagq6ogsq0/dabolenebiwirakerusopin.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/51528359858.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/n91ktm113foardi9prg24h7pq4/36247909064.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080c110242fb---zenupuku.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/65202652073.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/88592025405.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/10064637200.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/sumivevimopamurotikif.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddf0b23990---77250188562.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/lupalabedus.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/64386011002.pdfIn PDF document text
    • http://abwva.com/uploads/files/bometa.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/27062192340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=autocad+3d+tutorial+books+pdfPDF 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_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 10864 bytes
SHA-256: 14f1fbfad58752271ce4fb4d30a06931b2c13ef24de4080ac4fafda0ca2445da
font_01_sfnt_off00013e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E70 18080 bytes
SHA-256: e5a7126f9b05698d676ab793cbdfe9242fdabdf985d088b00eb1822039ed4785
font_02_sfnt_off00016d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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