Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffdbfa86688ffd9…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 14:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e384dc4a833809d25a767d294dc7717b SHA-1: d3439202fb8418b40f8b84ade7beac43b7253672 SHA-256: 1ffdbfa86688ffd99a4763c356fae5e627feb2516da8b6f52385396e88d874bb
176 Risk Score

Malware Insights

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

The PDF 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, with many embedded URLs pointing to potentially compromised or disposable hosting. The document body was unreadable, but the presence of numerous links suggests an attempt to direct users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mbeautyconcept.com/upload/content_images/file/gavazaxivivaraneluloref.pdf In PDF document text
    • http://svatba-emi.com/uploads/pages/files/lunozovokaviwo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613158bd92054---31851389004.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/tapeganol.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/petimi.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/44388303393.pdfIn PDF document text
    • http://drironcat.com/images/file/karenad.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/68545700064.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/53221122590.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137baef05d6f---74472364641.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/vewunijosememumanaxonu.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631466226.pdfIn PDF document text
    • http://dd-eng.com/files/files/kuzidu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/tmqmqlr117j8vcud5ncu5i2pfq/24521073032.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/0GqHM7Qawvjp.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/sajakuwote.pdfIn PDF document text
    • https://tch.lu/files/files/xugiburusiv.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/zewizabinujobobibej.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210909_045754.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/12492050415.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/volasefapukazupezojukupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+talking+caller+id+for+androidPDF 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_off0000bc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC56 10796 bytes
SHA-256: aba2a4177bcf2121664aeb3b12bd026a61eeb6b668e4bbc10cf99b645bba6f03
font_01_sfnt_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 16460 bytes
SHA-256: 1bf957c2668d24a039eba422847190d39ab8a461a73ef98688411f5fc3256547
font_02_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1