Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9340e1078895d5…

MALICIOUS

PDF

90.6 KB Created: 2021-06-29 21:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48b2d2d1403da75454b8ffaa8263fcab SHA-1: e074214c6eff5ef8975c03dca2eef2fb786fd1b1 SHA-256: 4a9340e1078895d572b00190f610d06d4f427bf81c8b4375635b6df335bdc1c7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the link farm suggest a phishing or credential harvesting attempt, potentially leading to malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7167a03a---superu.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6a925e5ad27f6d1fe403e6f01cfdd042/61944655859.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/laniru.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c609773c---65813232746.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b44280375b0---domotomawateseti.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4b43c6ecd---31081185394.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a429073f34---77995744556.pdf
    • https://aduanaldelvalle.com/userfiles/file/jagepotipafikewas.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076e3af294f9---85123521057.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0162d6e11---posajibasaf.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97845d1156---gapirixetematopuwe.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e2693471399cfca6316094b9c3e8044f/kevupiwodofatonoxe.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4220dcc9d---80639080525.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34dc5fda1---46792083405.pdf
    • http://alt-1c.ru/userfiles/file/83435041666.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609193f6164de---gagexef.pdf
    • http://dermaktif.com/imgup/file/84693451002.pdf
    • http://dmscsmartlifeblog.com/userfiles/files/dapinoxif.pdf
    • http://bi-acaovo.com/upload/files/rakige.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160afc40ab8403---wafixafefagirulukuzag.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8739844d4c---didagimuzonuzopo.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e2f7c849972ab0f7d2ba407830f3dfab/vezovukofevakasovi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ouija+board+print+out
    • 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_off0000e7da.bin
479a5bcdac91da37a1d2bb3f245318c0036e8baa747a2a3d85b6ed4813c59e62
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 17720 bytes
font_01_sfnt_off00011622.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 16792 bytes
font_02_sfnt_off00012e39.bin
c629367dd88201cf6146315a5b8bf331a6966c2725378f8c520f86b2752adc6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E39 10436 bytes
font_03_sfnt_off000145ac.bin
0386a1c13e6e24afeae3a6e9ab8ec32f3cbcd5598a0e2bd3099080bd2aaca191
pdf-font-stream PDF embedded font (sfnt) at offset 0x145AC 16296 bytes