Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31ac6f97573ddd7…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 13:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01f60d576fff23327d44553db4a2b3bb SHA-1: 48d8ea6f9b468436d948e4b3c99cd949000b7a1e SHA-256: e31ac6f97573ddd7ba48f630154eee0347e2d514da4ceee2024c79fc2b6fb6ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristic PDF_IMAGE_LURE indicates a common tactic where a screenshot is used to hide malicious links. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a distribution network for malicious content. The ML classifier and ClamAV detection further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=gangstar+vegas+4+mod+apk+android+1 PDF link annotation
    • https://unitytradefze.com/ckfinder/userfiles/files/68616678974.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/46149302309.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/tinodewada.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/86062049854.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/3153291045.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/93726353512.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/ririlijeseke.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/50095052712.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/rexogoveruvavoworivulevef.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/hduks5ll763kqf3f11lnchccq1/sufuvaros.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/83270417329.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/rejifulasiruxibifewowo.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/41221761890.pdfIn PDF document text
    • http://contextuae.com/resimler/files/95161884688.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/39425719107.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a41225bb960c26bbf59c9adc02acfb3e/68463122848.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/kuwelagive.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/fakujixisiwupisixobadub.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/90223382984.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/pejazojowikam.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/28634714768.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/72rg373v7tsi5jc20ockmeh674/35538644721.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/7051236060.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/sefobatuda.pdfIn PDF document text
    • 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_off0000b12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12F 13972 bytes
SHA-256: cdd28eef78c7a4b2df2fa5584ce649de60d7435d953a067aac61ddcbd8f90661
font_01_sfnt_off0000d38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38A 11016 bytes
SHA-256: 947289df011fc5a221b4ff227d23ba66f471cd4020bd00f0ec0e064b2beb2c3d
font_02_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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