Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa757700d0036d2…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 18:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04c3f0b05229ba5be2959068dbcb66ad SHA-1: 0b5cae1f5c66dd65330fdd06f85f28db0f0a5966 SHA-256: 0aa757700d0036d21fa14bfdaa6cb3a690d4ca5a9975cc048040c2a815a71e7e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host further malicious PDF files. This suggests a phishing or malware distribution campaign leveraging a chain of compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=why+do+you+want+to+participate+in+this+program+answers PDF link annotation
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc41ecd6f8---41132116268.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4b8694254b2bf8f1b5b82bb5dd4972f5/16113007414.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/pumerotufovumin.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827ada76010---sudujegafiwojidoxanoveguw.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qtfbod0it2k8r8hp64dam5u8a2/pobidenuvupowotumedexiwug.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/lidumanofituwigitezad.pdfIn PDF document text
    • http://gistys.com/userfiles/file/49894067483.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/guldlg833ej4vj1pl547lb21g3/notogumolosenulasabelim.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/39945316857.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/a82ebdfb8f524701a856af21e44fc323/dudifimobovunozazobago.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/luwisudolimifamixej.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb5d5ff68---ziximewewof.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/48892128174.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/sokuvumisuzobuketut.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/94285349843.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2fb9fc0075486968003403f266a8406f/wosovowujiwukalanejov.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/a0rr6v3p0m6lm386bu2p7deghd/20417302336.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/7ba9297c6d6a482913a859f83fbf512b/ronugazupufev.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f4778352---diginebexa.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/021701b859bc1015d44ff2412567bf5d/xixofufutabes.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/49838278682.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/19345483113.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160894b7cca388---kogipumovobugiso.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/41724475524.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_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 17108 bytes
SHA-256: 2ddf2bd2400fca525c337af7617cdaddb641f7241154feb720a399434c6cc5eb
font_01_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13496 11208 bytes
SHA-256: 293d6f3b7bbcc28311ed981f28831b0b9ccadce3333a8855d4470ce85e96475d

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