Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3820f6504b70100…

MALICIOUS

PDF

99.7 KB Created: 2021-07-06 04:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6a56478228432962a9e46ecfac5ad83 SHA-1: 39752964f05638984dec6c7cdc9739e040727559 SHA-256: d3820f6504b70100deb4b445943c02ee65c8480f5ffae816ca27b61b0de652c1
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/a11cc8daf4e962c6a609bcd4fa71f313/fizijawibijisafalujawaga.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/birokibipodididuloreka.pdf
    • https://oddluzanie.net/userfiles/file/wusazadiregiboligozefibe.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/88c750453db4f6a4b1738b7946a2dbfd/75435841044.pdf
    • http://osc-pribor.ru/products_pictures/file/xotoxabidipeb.pdf
    • http://tebsc.com/clients/84181/File/jolaxujepe.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160713366c706a---78392819069.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160add323cc28c---22058457525.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacfd19c8a---zawunuzijosara.pdf
    • https://binarbaid.com/public_html/userfiles/file/21222118610.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/05ce7ac2f1669dba9364f398728530f6/fujalev.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/bvvpugccebst8vrh7hnouii5j6/jusogakamodilagenedoz.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090bd4a759fb---24801183441.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb99fbb310---bupemivevelojodixewun.pdf
    • https://mollis.rs//files/96500565320.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbd7007c0b---51331447769.pdf
    • http://hvpeds.com/upload/contents/file/78101797556.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5db8c4537cad658246ef3cfeff8d5ef8/wilokujizedov.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ed1d569c94e984492e8752a10a5625a/35625770138.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-10/20210510101407574142.pdf
    • http://vasvaripalmuzeum.hu/upload/file/94941218623.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b47f6024a---67852908886.pdf
    • http://orchid-daikanyama.com/userfiles/file/sujovowokefu.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/24fba00dd560696d7f1db016868bffe3/serogogej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=purring+of+cat+meaning
    • 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_off0001250e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 16792 bytes
font_01_sfnt_off00013d25.bin
ecf198980b81462cee33ae8fe61920c4401b6ad0005939f1980165448c2ca7a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D25 10564 bytes
font_02_sfnt_off00015540.bin
39a1c0da9400633ab2c00032ecb188d88612a340ae8ccfa3cc224b83c07fe5b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15540 17272 bytes