Malicious PDF — malware analysis report

Static analysis result for SHA-256 204a9fcb4e5e6a94…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 14:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c77b6a13df39154203197b8d79e681d0 SHA-1: 8611bcc98c5a03df18ae1d9e542297bae947a594 SHA-256: 204a9fcb4e5e6a94ea704b1fb303193e40c930d237668e6ff878fc9db788cb53
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm heuristic indicates an attempt to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/kenidaneboxoweworefuta.pdf
    • http://homestationrealty.com/userfiles/files/vuwarumi.pdf
    • http://winhazel.com/indigo/ckfinder/userfiles/files/fituveratozadulamibikakus.pdf
    • http://dasbluemchen.com/pijokugizonuwusofap.pdf
    • http://rdmsrl.it/userfiles/files/zuxogovizavep.pdf
    • http://www.tramag.pl/upload/file/41819026099.pdf
    • https://episcopiaoradiei.ro/files/35415474416.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141add73923d---88079815230.pdf
    • https://tekdalyapi.com/upload/ckfinder/files/46192151818.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/bc9bd8157ad8507bdf3678224113ec48/57832027119.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jazodokadulibuwemidivuru.pdf
    • https://mkart.it/uploads/file/fuwasefe.pdf
    • http://doremimarlikinsaat.com/userfiles/file/30229845550.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e68aedf92b54c25ca6fc089fa2effac4/63060453822.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/3589979701.pdf
    • http://swiss-ex.com/images/blog/file/39226462397.pdf
    • http://thegioioto.store/upload/files/vefabiwizuwivigi.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1e9959a5c---rutofabixenakilepeputege.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/29045186166.pdf
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/5060176914.pdf
    • https://oreopay58.com/ckfinder/userfiles/files/gagara.pdf
    • http://fernandopelosini.it/userfiles/files/82833788024.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a55888fd---44551715492.pdf
    • http://yuemeism.com/uploadfiles/files/mejositusajavinumi.pdf
    • https://1tlstar.com/storage/uploads/files/76922544469.pdf
    • http://aleshashop.net/uploaded_files/userfiles/files/79422291637.pdf
    • http://whipitleather.com/userfiles/file/jerisef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wifi+router+hack
    • 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_off0000e993.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 16792 bytes
font_01_sfnt_off000101aa.bin
bad416da16d8f9eea06de6221bb779edff0d7b95b11efb3e6d9af8747dafa2b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 10300 bytes
font_02_sfnt_off00011910.bin
4ec05a31fb83980ee48ce3c510a65c554b922906ec0125f7dae7ba90846178d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 18288 bytes