Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cfbb8c8236e20d…

MALICIOUS

PDF

89.1 KB Created: 2021-07-26 06:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 181628828a1a045e10bb816a9f07c6f3 SHA-1: 9f5d23448801b19c24767d2879b11ba948f29dca SHA-256: d2cfbb8c8236e20d81de4704c4f9dfcddafd4cbd15cb49de7922db3f76c1f84b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and numerous external links suggest an intent to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/xoluvilokov.pdf In PDF document text
    • http://scales-center.com/shop/fck_file/file/16435842484.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/11508073755.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c180c1d5951---16349363359.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/jojaxarojowe.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/bizijofotakeloje.pdfIn PDF document text
    • https://strechybenesov.cz/content/mibajazarelifug.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/62467647695.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/pelavuwama.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160aa69c377a9c---47492184678.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9e7dbd591---82443847855.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/70d249727738c81865de249b005bfd8d/tatavened.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071203d6bed8---rejebi.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/83397508975.pdfIn PDF document text
    • https://ecoretras.com/file/87039213259.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e39e7315956b97db6502b10808a32f94/fadubamepopurufiwisoba.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3d1c6131---59449989728.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/tikaso.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/radivegexukix.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d8c2bb88---58931289163.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/24515945298.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c4c7c9aea---64600746543.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160768bb734391---71434478107.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/4055973104.pdfIn PDF document text
    • https://ayurmitra.com/files/file/sovibijemakigozabibozup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=december+7+2019+sat+answersPDF 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_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5E 10872 bytes
SHA-256: 0ed29de94466cc89b0b595bdfbec4dd48c4bd391338067b838d4a3ac8c5d6615
font_02_sfnt_off000127c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C0 17688 bytes
SHA-256: b151c82a81f99fb3447fcdb8627a591f0eefd76bbd56b61135059fb04324fa50

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