Malicious PDF — malware analysis report

Static analysis result for SHA-256 96bfb4f076461364…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 09:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a3ee019c68d22265e74565043aafcf0 SHA-1: 3f0ee6660ca051be6de0779787e74475da5ab447 SHA-256: 96bfb4f076461364f026d37ab4d8c011d5ae8366af03cd0280f61a19c90dc508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf7840643---jezujovabivunuwovup.pdf In PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/37867409444.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/balokenepokidage.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/59195630158.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/letitevemijatavagedu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1309508cc---17866203938.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/c70a786bf33af790ec78d0678a13fc34/dadadif.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/rozuz.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/28560550243.pdfIn PDF document text
    • https://irantruck.ir/data/file/70161381476.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/peziwemetekopatujo.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/dutududujonidebulaxegil.pdfIn PDF document text
    • https://aashianarealty.com/file/6725635586.pdfIn PDF document text
    • https://armenia4d.com/contents//files/wivofopu.pdfIn PDF document text
    • https://suksesunited.com/contents//files/27777203397.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/j8afiedq461qsb68nkpa5fr3g8/kedoxajedekawon.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16123b18a710a7---94942114622.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/wirimexigubez.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/dc2gaktnfcm0sqem4v61eqliq3/nexabujenija.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jv1jg93uarhmn9selu5nq0d421/manife.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6d332d8ae48453f47f25e39446fc2c46/49896244079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+mangrove+forestPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f18af595c8---mifidanawunejazuxedutu.pdfIn PDF document text
    • 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_off0000bdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF3 16984 bytes
SHA-256: 9127f61e6b013945335446fbf65a8debf87e0ec42b1320484358fdf3d65ae1ac
font_01_sfnt_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 10552 bytes
SHA-256: 37acd01bb147833cdd445cae653b3b104ec7cca7e2cce05e14bb37eb2bfcd813

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