Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af63dc748e79aab…

MALICIOUS

PDF

93.1 KB Created: 2021-08-07 07:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7bc85cb9924d2690dc05ca2b14f3dce SHA-1: dffc015df0b769437083c4a4de91a58347abce74 SHA-256: 0af63dc748e79aab9d391a970719eeeb229c81e8a5fd303e60b2919577d6ad35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://drafthe.ru/uplcv?utm_term=office+2010+activator+key PDF link annotation
    • http://furniture83.com/upload/files/86168859618.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/511687981.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076516db0a2a---70796460926.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54f248719---13686047034.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/46956528149.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74a1988ff4---96228498253.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c66dbbe9b4---zuzowatanosomegulasitibi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607d6bbd0d38f---20815007021.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085426537fe7---vinukaseripeboke.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/10507742853.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fad8816211---gopokavetizegi.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/dekonopel.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0cdd499dfacb1295f865da002606ac88/jitorobiwes.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/gekefizulanen.pdfIn PDF document text
    • https://giustofiori.it/file/rabijidunovuveboxodolewuk.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/rawewojowukedutikusitaw.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/83514376522.pdfIn PDF document text
    • http://screen.by/images/file/29785666670.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/24551816206.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/59180444343.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607659d910b44---96684391150.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/67017613891.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/96982900147.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/wanavesegezal.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_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 17208 bytes
SHA-256: bcda279eeadc83e82ec28fe1618c2746ceecd253e5d5ddb9f91a15c306d2333f
font_01_sfnt_off0001346a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346A 10600 bytes
SHA-256: 7d098228ba06ca10d9c117eada69163e14d2d1d51196efdad950880462b76f2f
font_02_sfnt_off00014cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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