Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd71821c9b7631d…

MALICIOUS

PDF

86.2 KB Created: 2021-08-10 11:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a47cd8a39ec865150a24a98276e5a33 SHA-1: d98ca86c6cb90d850f617a6c73bc06beee2e2860 SHA-256: 0cd71821c9b7631d6de5c1255394a3cb32cf4322056be4c0227a7467fbc97548
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://avandcie-energy.fr/ckfinder/userfiles/files/ruzifodaroku.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/a3cfdc7f7c08cafe0cd9ba5231fabf07/52876358504.pdf
    • https://lescourailleurs.com/upload/editor/file/dulanil.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e9a3aea52---23059235147.pdf
    • http://thebranchoflife.org/clients/3/37/37a84c4c47f147f839b5d5a44bb1b86c/File/zenojuzokowaboziw.pdf
    • https://jasz-pap.hu/UserFiles/file/xivaramebafedapidovuf.pdf
    • http://mea-travel.pl/userfiles/file/42476195730.pdf
    • http://mwflower.com/upimagesfile///86295443175.pdf
    • https://magicdiscoradio.hu/userfiles/file/zoxijukiko.pdf
    • https://zohopinler.com/calisma2/files/uploads/kulujarenoditezaxur.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6432243af---zowubarivipiwegef.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b1a343e4acf526608dc0d1e7d1552924/zapigalijo.pdf
    • https://hoangnhataudio.vn/media/files/mizirorawowupebok.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d7f779c89---79642445838.pdf
    • http://anhopphat.com/uploads/files/penan.pdf
    • http://icltindia.in/userfiles/file/jibevo.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf73947c1---62976127702.pdf
    • https://palcev.ru/userfiles/file/noxipuleva.pdf
    • https://demetraproject.eu/ckfinder/userfiles/files/zavasegupiwuviwoxudupidav.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada28b08455---393050842.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/be1f4a984887c5cef8790e1dd7586eb9/fetuzixo.pdf
    • http://influences-vegetales.eu/assets/Image//files/57563723971.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081abbf3b865---dewasevom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=evaluation+geographie+5eme+la+croissance+demographique+et+ses+effets
    • 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_off0000e90f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 16792 bytes
font_01_sfnt_off00010121.bin
7af6012df5c81e6f68c559e2176dea7d0511ae3f9d30a7dbc745366569c53f0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 18024 bytes
font_02_sfnt_off00012e4b.bin
7f3b1b9857d1031e202b6ee8a9a1092cb3ffb555de442bb1a48ed664fe072638
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 11496 bytes