Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c42356f2fdd7d3…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 14:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ff6aca983e2a730149c06e3fb872e00 SHA-1: 8a3d6b4a4133508f58f3f73bfe4f4b7341179914 SHA-256: b8c42356f2fdd7d33178b4e3a797057c1ea065a9c02427bb57e2fa476e40027b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The document body is heavily obfuscated and contains no readable text, but the presence of multiple links and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • 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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d8a7e7d66e1289021c22e48dda0875ca/wokakurofomasexevili.pdf In PDF document text
    • https://khambenhxahoi115.com/images/files/86026945318.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0hp4gumgfe7aisgo7h6u3gh34u/bagadifetedegojuw.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/70822697463.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5116c2b18---69011151027.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/2160341151.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/dasixutanopi.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6316b3169007641c1ea91ad152af40b8/14917339192.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096c3e8a9084---68441357711.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/62399934912.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/zupaxowaverukozomaruzud.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/59429870530.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/88692369067.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607085000c7ef---8869011980.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/7ha6d3i0gbja4oiafvv0l2fa9o/96289071514.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f306dfd4a---dusewimotasokelimo.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/71506576516.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/luvutagokux.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/mugikigifuxulu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611635edf0c74---99447600089.pdfIn PDF document text
    • http://getem.pl/files/file/48881417278.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/tafopoguvon.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/t4dfsrfeg01btk0t1ebolotod2/77745269598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=elastomers+definition+pdfPDF 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_off0000c57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57C 17848 bytes
SHA-256: 820999d0c3cf61854d1e7909135351348e8daa50175738f3549f262daeef3c46
font_01_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 10644 bytes
SHA-256: 4b1ec49d3a30080a886f1e68ee359fc36eb536fae0540dba4cfaa625f860163b

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