Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f298b9e769290d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 21:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a073ec2f0aceee17c5848c86b8f9b0c4 SHA-1: 83b1126152c4f776873bbf2d52e8d0dc2d5474ad SHA-256: 76f298b9e769290d630dcb6c5c979916c84d64b99bd50b27960da35cd7973cba
104 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness. The presence of a 'download button' heuristic further suggests a lure to download potentially malicious content. The overall structure indicates a distribution mechanism for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://urbanlivin.lu/userfiles/files/46530877976.pdf In PDF document text
    • https://avenue102.com/uploads/file/32270322868.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/tewoza.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/vesobogon.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/58578307243.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/zozalizudobam.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/84788938154.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/33375661262.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6d343ad463c45d028e02581a971a1f62/15877619053.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e632494930a---10063502817.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/8c332fee3073b93247c68b7b10f689b7/59248447449.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f778a8bf8c6f77a952778b06c3ee23c6/juzefumujeloxasadijurin.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/reforivisa.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1467b3d24---38493207370.pdfIn PDF document text
    • http://namngonviet.com/user-/files/62556556532.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/belifesej.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/65605795032.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/1347fbb123c40c92b91f0ca4cafea48b/pogorerudobonodufipagu.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/10609279069.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210811141517.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dcdfc6e516---ruligipogemebogupoke.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/23049286868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=flute+learning+book+in+bengali+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_off0000c855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 20528 bytes
SHA-256: 9c6827813d2535db23c774ac55deaadcd9131723536ded97a9afc4d67b63c5fb
font_02_sfnt_off00011699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 10816 bytes
SHA-256: 9adf2b6fc72c38105b5a504e218a5708953a8ebd1b0999dd69159d59cffb3d92

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