Malicious PDF — malware analysis report

Static analysis result for SHA-256 f881dd785d8c9b10…

MALICIOUS

PDF

138.4 KB Created: 2021-09-06 20:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99cf11290c11bbab31c5efb76f6d19dd SHA-1: e487e1a0eeef8d0ba6e224712ace32a06417b744 SHA-256: f881dd785d8c9b10128739b087c7f2a02e86b89243e92e7b4f8fae6bf13352ff
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm suggests it's designed to lure users to external sites, potentially exploiting them via drive-by downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.hausbaumesse.at/ckfinder/userfiles/files/82854281061.pdf In PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d11e73360a82e294fafdfcbb312760cd/3146772601.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/36349453197.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/190915298f438f183821145574b51444/vibemisakoxevizisabinaxex.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc6586c62a---napufaxovaru.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/82f14e916272cbca7a655cc09d4a7f74/tawenesed.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/36859794482.pdfIn PDF document text
    • http://xinyuemu.net/assets/202108/files/20210826083644327709.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7c144d4c---39351886880.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ls8873jm6h45sc6id1f5sercv0/sujilikivixiwowakijifone.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/39922460361.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5b947b4e---kasafiputowafuwi.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/jikutozugagukanilategeziv.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/63902415831.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/ca5471cbad3befc054bb0252046b8237/56818071172.pdfIn PDF document text
    • http://apsons.eu/files/file/xezawifulomelabaw.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mol2jmvc46olp5pmndoegjgub4/pewutuxipezurejasij.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/14543077141.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/duwubexuzidodaforulaj.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a1848831099---74571330484.pdfIn PDF document text
    • https://artbynela.com/uploads/file/69922923282.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b36355d46---fobevokegunakilide.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1610dcf542d445---buvilebawemolotufeno.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16110d316751e0---kawuvimizarejux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=iso+procedure+manual+formatPDF 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_off0001b7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFE1 10740 bytes
SHA-256: b394262d8983640277afa86678ff9477aaf6bd859417ebc51d2930e56e576edc
font_02_sfnt_off0001e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E895 19480 bytes
SHA-256: 06f0e1abb263ddfb0a2865ef70bbfddebe36490991f493a5821d0a1f06ec567f

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