Malicious PDF — malware analysis report

Static analysis result for SHA-256 a376beffaf267da0…

MALICIOUS

PDF

77.7 KB Created: 2021-06-26 17:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ee232f26c2d1e54d00072289c4e1be6 SHA-1: 18af4c8b2ab8d30e34fdcaa5aebca831ec55e63e SHA-256: a376beffaf267da0f92d03e1095fa6001b4f9b173fa067ba0cc0859049a4d9ee
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it is used to redirect users to phishing sites or download further malicious content. The presence of multiple external URIs and link farms strongly suggests an attempt to exploit users through compromised web resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://synerhu.ru/uplcv?utm_term=shredder+operating+manual+page+1
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf83a3e6ec---31452143432.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/37be311b874950e2724fd154be4e6d5c/zeraxapuforosufepom.pdf
    • https://aduanaldelvalle.com/userfiles/file/37753224460.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/bapamujuwajuf.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607643222f0aa---26855204676.pdf
    • http://baohanhranghm.com/upload/img/files/77224796972.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21ee8f63f---dawivisomakeluv.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b3c3b087b8b96289549993f3be42fa13/35465505971.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/susudurewexidova.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/22d566ed3dc6fc65c69f6946dd58818a/51576260895.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d608e5e7e3.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3599c591---35214526112.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jiu69egfdrqpqvoevsggfrpf15/21543500774.pdf
    • https://autotrans911.com/thread/admin/uploads/file/71442043787.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/4d1e86cc74fb1467e8e3c3388d8e2ca0/48655464071.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/89425a4ca234c2bc0b8c982eab8ac984/75613211809.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/14c9bbe7195128446f4973b9c47d0eed/jotap.pdf
    • https://akproauto.com/nbloom/fckuploads/file/91535768503.pdf
    • http://www.jindatunnel.com/up_files/file/reworumopiwepemivotomo.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609985ac0f725---buniwivozotovugivapijo.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/36896355221.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2a355a110b6deb6ba8c8d006a789ecce/diwapusajiluxagi.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/162443798281.pdf
    • http://cncforginghammer.com/d/files/zonifibiziwapubijo.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070d112551e3---94692089355.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd41.bin
b06478a2dff1cae2fa5670f0277b687927a3733307546de94b09e3e3d43838de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 16724 bytes
font_01_sfnt_off0000f8af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 16792 bytes
font_02_sfnt_off000110c6.bin
9c223a96e14789e761cb0c3af632163fd3a7f44eedf5ed9ce0e64ece3afc8d1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 10900 bytes

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