Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f66169aea0fbce…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 23:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bfaf4a9c0ec458cf6d3f448595db8cfc SHA-1: 0a2393e00aa8bdd11c3c57e429e15a7d1beba2f4 SHA-256: 75f66169aea0fbce822844951afa5a08e5b9d373fa4a66afcf3562d1ce2e1fb5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of a link farm on compromised infrastructure is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/7tbmsk8m7np86r58v9ir8ammoo/65821596122.pdf In PDF document text
    • https://puppometalli.eu/file/40931287378.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/zixoworokewerafufegajim.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/zopigimerusafewepawaxukow.pdfIn PDF document text
    • http://kunbot.com/upload/files/19499278599.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883df7e2967---malogukunasopepumo.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2ad4015b---69524238557.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160719492751f2---xoxixatugerobuxuromoxo.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d948036e999655bfd5b9e9e0f022f4ca/67417265437.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/44776415197.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xoluveresesesifegupakoget.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4500b6b9b144a241f135639a19d5eeca/41226656342.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f315027a70---50992889935.pdfIn PDF document text
    • https://ancoraeducacion.com/images/ginelerufimunofizip.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9d1908b1387c8e7dabe55dfa4c851baa/67039405244.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d653a13cc---timurezemevut.pdfIn PDF document text
    • https://medtek.vn/storage/file/35603331001.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/23589631271.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/xafusajababenowajixagaki.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/burijurupelanij.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/gumezuvosux.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/bosapinate.pdfIn PDF document text
    • http://apvn.info/userfiles/file/sovozewevogulajekazabas.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/03d6210c845e0e2f6be9b14099ea4449/88054839354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=risk+management+book+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_off0000d50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 10972 bytes
SHA-256: a0300e6414b96879c359177a62cf7bcc4aa8335dece948146b689c1ef38f51b5
font_01_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 17364 bytes
SHA-256: 7ca8bafa8be015f6c81a0a52150bbbee6112eddf948567a3670437a0cc708d99

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