Malicious PDF — malware analysis report

Static analysis result for SHA-256 096b0040017ee908…

MALICIOUS

PDF

104.9 KB Created: 2021-08-05 20:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e8e55aec324b42939e045cee7ed56974 SHA-1: 899f38852357ba3dcc8e0a53632b22d453fabe09 SHA-256: 096b0040017ee908ecd5318d2fbba28c4b85965feda97a2cc0728de6b4b955d0
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. These links likely serve as lures for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=discrimination+index+formula+pdf+free PDF link annotation
    • http://joyearland.com/ckfinder/userfiles/files/89581474922.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7900c86b66fca84a1fc1a96aff1098d7/sawodafune.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/82913945877.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/jatizobum.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/33806281410.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/dc76631b7b9027158395ccf0be37e97f/83672610754.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3d6198ae---27436221219.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91e9097a6c---53015054462.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161057936c0f00---38508814489.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/83961792523.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/668b43ee5fc8939b173ed0ad12c50af7/90880809533.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0797f12ed---besudimogivano.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/nasunowuvenogegifupaj.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/54732707633.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/buvisalirer.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/zovekavekawemetijijejoje.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/34276911982.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/xuzodifetodagitag.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/12599728923.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/43558190236.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/35087298262.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/84736033660.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2290451e5---noxodumij.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_off000133c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD9 10984 bytes
SHA-256: 463bba6131cb25752f6dde4c912d8387a85cd87d5b26efb7813a5f376ed79df2
font_02_sfnt_off0001655d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655D 18024 bytes
SHA-256: bb836fc984a43a66d54692602271a66ccd65fbe6186d17d735e44ac7265cc23a

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