Malicious PDF — malware analysis report

Static analysis result for SHA-256 088ebbf20faa511d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 23:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 697734f7dc30b5f9e06986fcc3c901d5 SHA-1: a9e8a20cb535b050b70e67380e243734c28955ca SHA-256: 088ebbf20faa511d847ed28833da2afe83e2c102f1ba3edaa9272bd1a6374f3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://satuldelut.ro/ckfinder/userfiles/files/62473278198.pdf In PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160886f0f93fe3---ragusogagesixuwu.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/3b771edb4a28c716927b9001beec8cce/tesatapiwevemogenexesox.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/97981055133.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/k3quqf08psbm4hss3mi5v09eh3/rabav.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ba74b30c---83381809201.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/78049290199.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/61950815089.pdfIn PDF document text
    • http://kleiberit.ru/files/file/53342059353.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/gixibidelifewinutiga.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/xonexozomoborir.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/51033451055.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e24e2437c---lidubituxus.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/9640373222.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/32705528998.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/28758408601.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/paripovuni.pdfIn PDF document text
    • http://flexa.cz/docs/file/62430407082.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/de4c63e7a4e91ef0093f4154c0b61134/21132857618.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ae43a2a91a23fe4aed59f0d6b1d628c0/sozidi.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9bcd86510---zokebibepafurulipuf.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/u1n44pjlt68sm8psn5gkel1vu0/10016324756.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088787450df1---pojoviwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=words+that+start+with+nuPDF 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_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 10348 bytes
SHA-256: aa1118926c306361a466e0b23b2dcb902ff9bcb201a0e8ab6f709507b85e2a22
font_01_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 18384 bytes
SHA-256: 39277c6a84af4074893363a897098d744c9d2f740fbc6323da5cd44824b52f43
font_02_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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