Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7cb4d2b1b3db5e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 21:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ea8149582b4df8dd36f5a1e21488de9 SHA-1: 04c0bfcf34fa43829dbf84bbc3ccc36b3beb3ec1 SHA-256: bb7cb4d2b1b3db5ee9b793e357338e09de086bb22f7683b80aaa3e35304af179
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sdhouse.info/ckfinder/userfiles/files/sezufos.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa71a83ed---77976186895.pdf
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/79328952615.pdf
    • https://corpus.bg/files/fck/file/59094816725.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/kidimewomud.pdf
    • http://aedelsur.com/contenido/files/56900088273.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/20140400733.pdf
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109191346344173.pdf
    • http://nail-free.com/ckfinder/userfiles/files/26735286367.pdf
    • https://novahealthclinic.ca/userfiles/file/liragawotebi.pdf
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/16060359030.pdf
    • http://cncsprings.com/d/files/63565697508.pdf
    • https://processwork.archerhuang.com/ConImg/files/surasuvizesetu.pdf
    • https://njshore.drinkpoint.com/uploads/files/janopojezutaxufelefu.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375950eddf3---42971125843.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614271a380680---vifaxefezelarefinelisog.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/sewipidifuwizinikeluru.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f31e3223685cf79c1b97ca8e79cf6c04/12491140884.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1b85e28e06dd34eb5bc2344d90d1cc22/30081379926.pdf
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/86689971470.pdf
    • http://rafaelstore.ru/upload/files/65719617133.pdf
    • http://bollnas.boj.se/uploads/userfiles/files/tupeturizisixolatuxe.pdf
    • http://provia-events.de/pics/fotos/1/file/53173954018.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/54e0f15c97640d90870bfe214bca4da5/suxelujoraxutesab.pdf
    • http://bebaldebaran.eu/userfiles/files/wuladowip.pdf
    • http://nriloan.jctoursandtravels.in/files/vanojirelepadaweweg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=jiosaavn+pro+apk+download+2021
    • 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_off0000e0a4.bin
bcbe9b542e39fa4e6902eb01d0ed898c9ec3561f8e9a81bbd0323d3260f17cbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 10684 bytes
font_01_sfnt_off0000f958.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 16792 bytes
font_02_sfnt_off0001116a.bin
330d334d3f64b931cb3bba51bed90be783fe89ebe0f4166cb89b8fbfef452d91
pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 17436 bytes