Malicious PDF — malware analysis report

Static analysis result for SHA-256 a491595afd5b428c…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 09:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73f280f020971fb1670962712d7319ca SHA-1: 5d6d4222eef538dbeeaef285b9b7e115b0080d47 SHA-256: a491595afd5b428cfd0503cee1a44467c1db93ff2b450c42a69f6bfb3f3ed654
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or SEO poisoning campaign. The document body was unreadable, but the presence of embedded URLs and the overall structure strongly suggest the file is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lepetitjaunais.com/userfiles/file/57232337927.pdf In PDF document text
    • https://newcar-rental.com/uploads/files/202109081611099622.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/31189269363.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aafc47bb3f---nimefegepop.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/dutogitixo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136847ca322b---gekawaneromaxuzorasi.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/nanuva.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/lawumipoduvinoxupikiwi.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/zuworewuvagodatetiku.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/33558191163.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/wewigunulojilezutavu.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/sawipepozemopi.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/78036744126.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/relevoxelefiwotogu.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/24702833645.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/rupexogigegurafa.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/zalojofebos.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/kasivasanarobetipukiwip.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/3353393148.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/kabunowidagonovut.pdfIn PDF document text
    • http://krupongs.com/images/file/96833250495.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/dajaxagebinokemoxe.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/46d2447cd31ff160397bdf0f018daf4c/debiwepazukewebuwiwofaloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=beyblade+code+scannerPDF 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_off0000b9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D0 19712 bytes
SHA-256: b25d5f7cae3a665253101783a2f2ba4ee1b1bd9a97ada6d3ecd65dc290b983db
font_02_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 10480 bytes
SHA-256: fa58d7303b8fe561d2fb954fb95af8f59deb16f535c2978b0a62eebdae8c00dc

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