Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34d598b4fd8c487…

MALICIOUS

PDF

78.1 KB Created: 2021-09-23 02:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 333b7399d8f9a8dfcbc247e030dbc87d SHA-1: 85d98b6aa7f8a860ff1fbb31d793bcff79bb6195 SHA-256: f34d598b4fd8c487c9e4a66059d661756cc7f777d200995b10e83b766c7a2a70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://csc0516.com/userfiles/file/20210912012939_g9wz5i.pdf In PDF document text
    • http://yuhuimachinery.com/d/files/pudidituvonebe.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/62446637672.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba2345fe0---nilul.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/39750511011.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/rovexofusozosakizo.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/jixanewomemerexosasub.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/31815334039.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/fipuzoxu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/id31206ej7pmeoso2rgkb5l533/44125292703.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/jegamizezinifimokeju.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/76053072902.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/fusededarujoj.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134675c3ee27---rozezuxupabag.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/mepevegowisebimimoxod.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f7f796ec6---lenobibuvovizelejenubaje.pdfIn PDF document text
    • https://emenu.hu/editor_up/67230704387.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/92899642647.pdfIn PDF document text
    • http://marine-inox.com/i/File/gizijurozupozodi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614badda29c8b---babumakagezur.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edfc0cf9f7---sixojasivaturi.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/bavavuzowo.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/zimotali.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/wafoxaleronoxaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=zombotron+time+machine+hackedPDF 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_off0000cbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE1 17832 bytes
SHA-256: 1dd829860dc1d2bd4686d7b9ecc7cfba5d27366608bdb7afb71ab0b05aa3840b
font_01_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 10616 bytes
SHA-256: 18d4542c5576c40d0310ccf44711f31d1c3aeffe1bb5b2520ab5558aa747729b
font_02_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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