Malicious PDF — malware analysis report

Static analysis result for SHA-256 2024e38e344abf44…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 02:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1420acbc7f0c1d0ca70d4e1be24ca05 SHA-1: adc54318e1b59c189f8796376c4a797a89b81bd1 SHA-256: 2024e38e344abf44a92ca1e610247ff86c64a8851d66f15ff057649e9e16e526
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of external URIs and the nature of the links suggest an attempt to lure users to malicious sites, potentially for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://krisoc.ru/uplcv?utm_term=camera+settings+for+outdoor+portraits PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f29adf0a---pixuxuzefaxe.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f89401edeeb36e1a96cff106ed815daf/nekofun.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26a23caa25---71255687187.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/lewaf.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/59561553339.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210710_110211.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/79336638251.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lpkchhjtkf0k8ng21uiusc95r4/91519597557.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c884e080ed3---229552463.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/92def2e435f440ab676e1ea46f479f1b/zipesamevubabiru.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff33e019b---93146176351.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/54393822739.pdfIn PDF document text
    • http://mega.kz/media/upload/files/simawelukusa.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8ddd7bf20---14561285694.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/sivakofezevibo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b59a2cac6---rapivitoguzupigagigimide.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/13256580807.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/70957114643.pdfIn PDF document text
    • http://muszempilla.com/files/file/48773622898.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/77988197726.pdfIn PDF document text
    • https://wsbtitan.com/images/file/mometiwadopibirevutesemo.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608016b2305da---fogipewisopulutimewuz.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/81690483034.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_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 16616 bytes
SHA-256: 5d65e2d95d0d14a343b23d5ddc0fcef83ee2c7c2ae17d985b66c240bb5cd4852
font_01_sfnt_off00011809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11809 10924 bytes
SHA-256: 87791d673c447a11ffe99a47ed6e28b9093145da5bd4f7438e3c72a4a74d7342
font_02_sfnt_off00013121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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