Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb8ae506d87e0e2…

MALICIOUS

PDF

91.4 KB Created: 2021-07-24 00:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90f44978624f0cde19d49fe114142633 SHA-1: 010cb23830e61816cf8c42633ea2291a37137bb7 SHA-256: 4fb8ae506d87e0e2c3beef7e783195ce340e0f61bcfadcf6bc0bd37ffd61b393
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://banphimchuot.com/userfiles/file/65072157775.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f294076f359---walanoz.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2630cc9fe0---batakuritaje.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f4e3dda890b114f07feffb3f13fd7e2c/68221920758.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607074741d3b9---91562446521.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f84cc6658c0---92255244411.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/koxidotov.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/68768397025.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/92a27c9db9423e2a38c7e92821805796/pazosaxopu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eecf09458---12836032777.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/semepedobone.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5370eaef59---zuwaboxubibefuluku.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/81565925820.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/36824527610.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/f0200jkp8r67fmnkr1r5a0hq5u/sikezevifugobu.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ds5scu17nhc1dmda0eoap6vbc1/84062727883.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/12671696101.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/mutap.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/75809871741.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/sumezu.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/25164640588.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/fe6rnb136qd3mm5fqhdt6tmcj4/tijujotuxivejuf.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/57489866042.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/19085708333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tera+chehra+jab+nazar+aaye+adnan+sami+mp3+song+downloadmingPDF 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_off0000fbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 11528 bytes
SHA-256: e7099b4b6b4ac9965240e9bc7b88dc7795242ffdbff83646759ef136b9fc2099
font_02_sfnt_off00012e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E89 18704 bytes
SHA-256: 971f2ca91f9d0cf83a591bf2a4c5e174c7f732ca7128bff50eaabe4f0dfc1c02