Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99617f9609e6770…

MALICIOUS

PDF

85.3 KB Created: 2021-08-15 14:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6bf5b9d5312ed0fdb9f79dd31ba7487 SHA-1: 3a668872ff4d81e79fb1e094850e542fe0d80873 SHA-256: a99617f9609e67705fa16b3956e088024e1db97937cf96a59cef676fdbe6ac0d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of numerous unknown reputation URLs suggests an attempt to distribute malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://petrovsky14.ru/docs/files/voxitilobilaxor.pdf In PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/xiteluxavexozopolenup.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sibokevamite.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/30566630187.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ntnd30lnmuufj8rblh43ngjsmn/vipetanigijepazarirudofu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fcb23ceb628a5b28258b4c7b8ce8938b/kaweja.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a94c090dca9dd94f85d1eddedc0e080f/jebinanutinem.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dc200a3ed---23601891584.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/66934156094.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7c90b8cef2ec70dd63af7e7abf90c6ef/ribepezatikade.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5a78bc6a0ea95f09f13177be4e485bd4/7658020235.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/selutitesefinate.pdfIn PDF document text
    • http://iworking.vn/uploads/files/kujugabemupivegu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b610383d2---xufadaf.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/88515587790.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/dgbikb7vpdve8vp25v3femjs15/75559267526.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/51993205811.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/84127852661.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/49322124762.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/rapoxozukimaxolatozomamuv.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/72046444434.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca43029980---totumabux.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/jafutiwajemezi.pdfIn PDF document text
    • http://ihdbd.org/upload/files/42922800626.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609094f36a3bf---wurevelerujeruvog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=labyrinth+board+game+instructions+ravensburgerPDF 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_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 11148 bytes
SHA-256: c651562c2e14ede2e6ff3822984381a312265f0f0b0e560e626ee0e70f25bb7a
font_02_sfnt_off0001194b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194B 17180 bytes
SHA-256: 73f29e1931c0bb954260c09f4ceaf9a01a228b8d08368ddbb97d8a324b44527c

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