Malicious PDF — malware analysis report

Static analysis result for SHA-256 0624b8d1dbfbdfcd…

MALICIOUS

PDF

91.5 KB Created: 2021-07-23 01:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c97a6c6c971d0a9945f469c78c44b5fd SHA-1: 16edb2e9702a2a1c0b730fb1bc3bef296b25333a SHA-256: 0624b8d1dbfbdfcd04080c8944d87be25d99bf94979d8290076383fb048d8943
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://gps-tw.com/CKEdit/upload/files/bozupoxajevom.pdf In PDF document text
    • https://atlastoursntravels.com/userfiles/file/dejugameretod.pdfIn PDF document text
    • http://wirheiraten.de/images/file/68659771605.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be49ba0b6---75320779319.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae53a52a1---jolewukenew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2942cf615---todedalasixiguxibegab.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86f4fea944---riwomofaxujaroxuxuj.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c16f4bafa6---torejelavobemaloj.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c2cf409dd0---xuwom.pdfIn PDF document text
    • http://teraval.cz/res/file/difokijawaxexifafasebasa.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/folofipalotagevasu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce039388be---tokake.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa8341cdf---nurupibowo.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/ef88ed3c86a7a3c5ccc12f91e35620c3/17153453047.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/mawetikofo.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/getugobilebi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/sikulojesovozutomiki.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/fopatixalipajoxumaz.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a1ca28aa---44133366124.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4pm2me01s47bsgpdm23upatjbn/77191748422.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be5aa92cbe1---nudobibolujisid.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/99435653500.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/44400278656.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xopuzunijo.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/lipixikepipewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cause+and+effect+worksheets+7th+gradePDF 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_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 17108 bytes
SHA-256: 0f998a56190d9f2418f0ee37b720d31d9d4b810879074bdd6710da6b78d15c67
font_01_sfnt_off00012dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 10976 bytes
SHA-256: 9a57c6d8c6497f1e7af821c3cd060c7a3c490c2f2bc4722fc5a2a90a46f584b0
font_02_sfnt_off00014729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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