Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93e7fe2f1852801…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 19:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d5e87748d23c467e87cb2d04349a5bbe SHA-1: 146652e4aa258959a25bd7ceec000be7836e06b5 SHA-256: d93e7fe2f18528015c8406a3a9ce9ec75fced7fbb5de6b1bcfca8f1b394facd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://carparts-fixture.com/file/file/43559432121.pdf In PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219405559131.pdfIn PDF document text
    • https://granitnet.hu/editor_up/lomiwipatifoxanifore.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/bexizepa.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/85689239806.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/fabupidobebifugopat.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210926214920.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/v4f2lubj9har2e9oedpvc9fr1q/79228413116.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/38493809207.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/22509755175.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/j19jbdccjes82uhl7gibpcc4i5/94577696089.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/8012717892.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614f56254e588---40621355594.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/58271065293.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/bijewovoruwi.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/xanijokejuwogedanurij.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/21280956646.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/85455273573.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/guwalamo.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/12005628029.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/midomafanaxaweraxuvezaj.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/35270228905.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/rovazozimuvavupomixego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=8+pool+cheatsPDF 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_off0000b0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E2 16776 bytes
SHA-256: 0e5530a482b2a204c6e2d78f20f7e8f5e9ac0731dac781512c837e2f13dc7d69
font_01_sfnt_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 10288 bytes
SHA-256: 92def03f1140e89b7060895d9c9e7a07eebd497f7493f07b74d04a4a7421dfdf

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