Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b00c94b5ddd8ecc…

MALICIOUS

PDF

79.5 KB Created: 2021-10-07 11:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 34665f3e6e758ec9651467761879f22d SHA-1: eb6b374beb614bd935833d8ae48581ab505e526c SHA-256: 8b00c94b5ddd8eccc5bc7cd61489b26c891c3709b33b0b1e1301d972f3ee118b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378192a6627---62109611618.pdf, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d75cf59dd7---83904756971.pdf In PDF document text
    • http://vanhacollection.com/images/files/62160865247.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1633332645.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/47127585577.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/lefejuzisujominalovonak.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/39504088311.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/95898372015.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/vogezibag.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/34104736494.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/rowunotulumose.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/pikenetevepimoluvunoxoxeb.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/waxag.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/xexavub.pdfIn PDF document text
    • https://denimder.org/resimler/files/bikavim.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378192a6627---62109611618.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9967cde47---89104621401.pdfIn PDF document text
    • https://adci.vn/data/upload/file/xurinavalexagelaruzatabo.pdfIn PDF document text
    • https://eventaipei.com/upload/files/rinapevezoradilazev.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/kajobexar.pdfIn PDF document text
    • https://kor.mycultureis.com/FileData/ckfinder/files/20210929_F3AE5E21D7B17C04.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ca73b156501ca8eb6fe9f9c8c9c69202/nazotumuzutix.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/gomurubis.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/xuvikufifowuwiju.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/66813625448.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/kademekowetaxiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=divisibility+worksheets+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_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 10828 bytes
SHA-256: 71ba8e5ae5de466883a3066f10f15228436593094b1af8845beee0d6d4014218
font_01_sfnt_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 18692 bytes
SHA-256: dc7dbbc31b8be9d85f435c65b04b7b8c0b50ab8d19a99d416e4cfe62cbc29bc9