Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb8f9ec2e84f1bf…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 15:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b95ecc1e1f8556b0a60f26880fdd1c57 SHA-1: ba6b98b7911e869c8b597fc1d9503bfc4b3fc2df SHA-256: 7eb8f9ec2e84f1bfad156baf513f8afe54f944fb96e74f60a0100b5c26e8f8ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sujitonweb.com/userfiles/files/vikalenoriba.pdf In PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/pawolafopojovave.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b08ff9985abc84ec76e7881ea880b4c2/dowimususugu.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/66454158130.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/34154230165.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/zemirij.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109080801518622.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/46531780557.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/30941652855.pdfIn PDF document text
    • http://allasclub.com/campannas/file/47485593186.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/16077068262.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133194698c25---nedovev.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/72160935682.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353adb3ac90---6494004131.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/4840892880.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/27831338394.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/17523049987.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/35329638349.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/donakubatamobakikon.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/zewexanijo.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/35014405604.pdfIn PDF document text
    • http://strandedtattoo.net/file/15641080151.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/zamewegoxawep.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/janofutuveremow.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/lejupelosus.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/rezujawabasizepovevi.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/97127975055.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210908151841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=reticulocitos+en+recien+nacidos+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_off0000babb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABB 17384 bytes
SHA-256: 723e49b60f9ff6b04fee6cc9ad405a67ad81b0bbd33b30dcf8de20f5992bbbaa
font_01_sfnt_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 10756 bytes
SHA-256: e3fd3adbd779bfad3cff6595a140e5b83ba2733592e58c15c08ea049cd7156d9
font_02_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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