Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6bb4bedf815c96…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 18:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aed5a40ed2577a5facd081ea30851d68 SHA-1: 948505046453aade5af706516d04f812cada431b SHA-256: be6bb4bedf815c96424a9c8a0365964bd8be2d2c97fc2b982b76fc2ec82f67c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://queure.ru/uplcv?utm_term=what+is+side+angle+side+postulate
    • https://alatheir.com/atheirwsfiles/file/nejugogokemuzak.pdf
    • http://penzionklara.cz/userfiles/file/nusabekavagekanefonezulot.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/0fb8b8ca265740acec8e3714bd4f7a3a/jafijaguzodolitorinewuwu.pdf
    • https://vicotelecom.vn/static/source/images/file/lenabiwiwudofi.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086dac0c67f9---refarijotezawuro.pdf
    • http://hacoauto.vn/upload/files/88084336160.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7365ca70a---3494536109.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/24a8cdfaeb633a866a9adcd9d287cf86/79081013208.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b93195d67d---dolemanifusi.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5c609959f---68250349514.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4bc9cc1885bfc6c1f8c65e4d8ff398d2/74903168990.pdf
    • http://amctop.com/board_data/editor_img/file/202105211111.pdf
    • https://nestaerospace.com/uploads/file/78548587593.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ede6cb044f---72384023175.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/8f1be867fe61119fd3964796438861a9/mitarikurawenuzijaro.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b675bfc0d---66870126392.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/846c5dec76b10ae72c49250da2b29bab/kuxowugobavaluvitu.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/86bjg7lhealls686bhqsdb4ke8/42447364127.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1265fb8f36afec42391e638779846394/70827180725.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45ecec9eb---4263278512.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e145.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 16792 bytes
font_01_sfnt_off0000f95c.bin
4bb7b8172fc9800ff4c0308e1d7e09a6a5495b059db709814d66bb277d80544f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 10664 bytes
font_02_sfnt_off00011184.bin
713872cdb92b36c9804cfaabc8fc8b31cf8e5baed373d79c0a97025710afb7a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 17520 bytes
font_03_sfnt_off00013fdb.bin
34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDB 16168 bytes