Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca10c5899daffda…

MALICIOUS

PDF

90.2 KB Created: 2021-06-30 18:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22b051e3be58a5a7442079ac244205fa SHA-1: 9120a2ccb21bd261c6fe415550652954b1fbe711 SHA-256: 9ca10c5899daffda331fa7f21f7036bcf115d88a7502d33aa088ac0b8880fcb3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be non-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://bannermaul.com/userData/board/file/femuridigudagiluteral.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/pkng7vi42i506nr00bv0sl3970/xiwimukigepow.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/wigebom.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fcb95e76bb55ff9e95c194337cd59a3/sulodena.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5597618b15b91ecbd34a9368b7885c90/bazalesusi.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/pdba2kgba8ola1ilo61aoroivs/23223924505.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/b710693c745f165dad77540ab0d5ecce/28537372779.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608327536df3b---pidiro.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ohf1nc6r0ffjcq6jmr7q01f39q/18695823099.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9755f2ebcb---83649957679.pdf
    • http://cuacuongiare.vn/upload/files/wenelutizijewapisa.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/n1i0c1uu44ospaaa3n6443690b/dizafugipa.pdf
    • http://rockpapersun.com/upload_mce_image/file/mefakopopizeduwizorajejuk.pdf
    • http://anthonyvienna.com/sites/default/files/file/zigosi.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763fed5318d---50110189912.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/7ff2c477669c611ae793be354d8c57e6/wobow.pdf
    • https://africanresearchcenter.com/userfiles/file/wigowogazilomiwipo.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80d37e254---59933745188.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607874b925510---dorijazela.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/kkafst5p0k00037mhg5phjk195/98542365708.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb60064b3---83792667559.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa04d93dc6.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095af8a43535---lexixonuj.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b549598ff74201631677b51ac67a826d/buvatimeb.pdf
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/88910886112.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+freckles+in+the+winter
    • 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_off0000fddd.bin
6e2b39046ffe95042eb188629217bffd842c7f68685e9963cd12f9ffda49164b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 10620 bytes
font_01_sfnt_off00011615.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 16792 bytes
font_02_sfnt_off00012e27.bin
2212101f9d80e1ef35a9c8525ac8a356b0d816d3ba6dc3c1ac146da655853759
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E27 17348 bytes