Malicious PDF — malware analysis report

Static analysis result for SHA-256 107b16dacf295581…

MALICIOUS

PDF

88.2 KB Created: 2021-09-24 04:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f56d748596616b1f467bc082752ccc58 SHA-1: e3e96a29ac35391975a0c95e028cefb843840953 SHA-256: 107b16dacf2955812e1f32b2dbd98de0c463dbfa64e9c1c242a6324a4129960e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to various domains, some of which are identified as compromised CMS uploads or link farms on disposable hosting. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=best+productive+app+for+android PDF link annotation
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/vugajev.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/ginaferelagapu.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/86205153262.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfeedd6fed---xabolufilepovu.pdfIn PDF document text
    • http://soc-in.com/data/media/files/6599008096.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/furilesovas.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/korebuvosivusefuno.pdfIn PDF document text
    • http://allier-genealogie.org/File:/56478182540.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/motikitaraneralekekopogin.pdfIn PDF document text
    • https://priscar.com/documents/files/17416565912.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140aecbbcbcf---28662946780.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/54820314636.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/pebitenumozevotu.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/30350518497.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/bugaxirejafukurebodob.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/fozovejimimobozozag.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613569879a0bf---pumimige.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/72862066720.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/datojelutovikijuxafu.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/veziviwebimilum.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/faxunuvere.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/xuziwakuziwisomogof.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/54928097153.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc429e062c---58667714136.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_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 17700 bytes
SHA-256: a832ed838328eec5172d5951384c02dc9e5ce920ce3d47b0c9133d262f798cc7
font_01_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 10784 bytes
SHA-256: 7ccb1fc3f61bc3fa9fb554eaa7bf83a9a7036d6bd48d3f3ee92cabe59150fc6c
font_02_sfnt_off00013b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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