Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff74bdfbfa3fb9cc…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 01:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 283403c64d89b2f172b417d567d3b67a SHA-1: b8ebe0d0395c7a1e183ef2e764f0367899c8642d SHA-256: ff74bdfbfa3fb9cc1a3e07062c2a141797bd600b17fd128054723662088d381d
164 Risk Score

Malware Insights

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

The PDF file contains numerous links to various domains, many of which appear to be disposable or compromised, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a trojan. The presence of external URI heuristics and link farm indicators points to a strategy of directing users to potentially harmful content, possibly disguised as movie downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=wrath+of+man+2021+torrent PDF link annotation
    • https://gabinetpro.pl/kosmetyczka/krakow/files/91885036083.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/71067988804.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/kunot.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7edbb019---66793446327.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/sufaxos.pdfIn PDF document text
    • http://888chji.com/userfiles/files/jawuduvamekutapug.pdfIn PDF document text
    • http://rococosofa.com/files/files/pifetadomevipepefokan.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/lokolumajadobejewapuraros.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b69097df---gulatogifezokowazufawub.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/tedirojemowa.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/bamidexobeko.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/fokepezup.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd0e8eb3ab---gajinimozadikadiloremive.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/42814075217.pdfIn PDF document text
    • http://orem.mn/uploads/files/60025817715.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/fimixerowozofodovidup.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/29524817057.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/77155789938.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/23516646362.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/latisipezixaroka.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/5236305591.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/demizekonedoferovili.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/lenazifefiwakurudimeze.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/namadox.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/47194568901.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/31076573877.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_off0000b9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BD 10460 bytes
SHA-256: 0117f76da22a0fa624ac7bb7f9cf0622ac1182af1f6c0dcd098f6b2e9a0976ba
font_01_sfnt_off0000d163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD163 17772 bytes
SHA-256: 3b67a7dc57ef951b81ec168eaffa7b0a411a6eeaf29020887af64be33f7ec760
font_02_sfnt_off0000ffb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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