Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f42d22408711c8…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 04:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6fd7e98f22fa80e1037105f09fb7c2c SHA-1: 30ea5a588034fecbc024f4601fc8dc3387899dc3 SHA-256: 39f42d22408711c861670c0c2908081ca229814fe39da72334aa004afe28addb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and potentially disposable hosting. The embedded URLs suggest an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c94df48f2619a018ae7ae45792585c5e/silezewijopaw.pdf In PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/89514825006.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/pewofivifalododudozatu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff776b9dd---jibotuxa.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/mukanizibo.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15307945629.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gv91d750cc1okf2050j9jibjan/65222289447.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/vowofalaworip.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/35961706079.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161411c5427c87---ludabafisakupewe.pdfIn PDF document text
    • http://berbun.com/user_img/file/93435306211.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/18325034125.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/51299154741.pdfIn PDF document text
    • https://wecareprogram.org/images/file/jevib.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/21798140680.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/refolijipi.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/tanaz.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/85590693666.pdfIn PDF document text
    • http://kant21.com/userData/board/file/70307016635.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/5210417374.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/41176313545.pdfIn PDF document text
    • https://bunianco.com/other_files/File/99932631074.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/45226136626.pdfIn PDF document text
    • http://teplospectr.ru/images/files/tosepuziwulepakukoketu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=death+moto+2+mod+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CF 10596 bytes
SHA-256: 9fbad386f8cd83f6cdeb130d8056c91f84559bbd2a2497c91d967649e9685b98
font_01_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0000f7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 20892 bytes
SHA-256: 4e1952d8c3d5e09118ef4ea0d1b02a21525e7b8b673d780311f863c0bd65c019

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