Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2583672284aea0b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 10:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a91e724c5adcf2531f29a4be698dc7a7 SHA-1: a376da960ab8619a978aedcd66b61d73e30af658 SHA-256: f2583672284aea0b599b8555509f846440273e1c9232a136f347c0bb658092a4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm used for distributing malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common method to conceal malware from initial scans. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=how+to+debug+phone+with+broken+screen PDF link annotation
    • https://korankertas.com/contents/files/dekikolutomazowisilezax.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/94614573798.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/98365200274.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8a05bab4---moparogidadudomidepodesow.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/gedonafagizuri.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/7528505456.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614192b921141---3377730090.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/67663998662.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/favujib.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/21449948579.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/3051269239.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/tokefid.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614095d045e18---nedesaduxovogeg.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/75332318315.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/11885518295.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109120720021001.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/xisivogodux.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/liteved.pdfIn PDF document text
    • https://webrobogo.hu/kepek/loridutirenirifivos.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/73562887174.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/96376189246.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/78927773870.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_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 17908 bytes
SHA-256: 9c4d320c4c78a70a413ebf7e0ed032ee27716ae942bd9320942d6057441a499e
font_01_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001270c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270C 10992 bytes
SHA-256: 7081ce4cc2b317aa87f28e414ddb2c6e6c5879ed83cb5caf0394c45cc42511a5

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