Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7a00d8903a89bf…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 14:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f64f120b4762b4aa37dd51fed41021ca SHA-1: 3e90d428964baecda1cc90a03442803386ea198c SHA-256: de7a00d8903a89bf9323f9f918efa5a93def310a306407446b2f626d0b43cbfd
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://agapetown.net/ckfinder/userfiles/files/75243291490.pdf In PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085255861d98---satoxagamujizatukoti.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ebe3c02c623b4043af397bcafbbed26b/28640261148.pdfIn PDF document text
    • http://acelybio.com/upload/files/62178561659.pdfIn PDF document text
    • https://onlinendttraining.com/files/lepumijekedegumugid.pdfIn PDF document text
    • http://devveb.net/userfiles/file/67483699294.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106292014309103.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/75964724817.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sibijigememimanijavoreguf.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160999ea376f05---xesebobanag.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/79vca3g8jcmeh6omttigj7o1i0/filexu.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/59475245119.pdfIn PDF document text
    • http://abwessex.com/uploads/files/lalodazibofusojik.pdfIn PDF document text
    • http://yuhongzg.com/d/files/24077296915.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ghumaiu3q9oc2qmi7r50janio5/73649561496.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160864a291e10a---36423773512.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/fufumak.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/sabenumikevebizudozime.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/74807129960.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/72796744557.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/63502827736.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d228061b---mizizat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=electrical+appliances+list+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_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 17652 bytes
SHA-256: 32bdc1bab77b869f14c8a54e68d715bee2043a5cbe51824b0fcab2214456a447
font_01_sfnt_off00011072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 10476 bytes
SHA-256: 8050f5f15531886164413633a8f7e71fc3fe8ba47abbe91c6f393a7969b003c7

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