Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6cfd4284568156…

MALICIOUS

PDF

88.4 KB Created: 2021-06-30 06:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd2965a9a9c5f1ba1a4a1978bf83b483 SHA-1: 85abf7e5cb3515841578e6121e46085bf419a015 SHA-256: fc6cfd4284568156a68ee78ca30cf29b398da29a9b49142bcf5f39067544adf8
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm hosted on compromised and disposable domains, indicating a phishing or malware distribution attempt. ClamAV also detected it as a phishing trojan. The ML classifier provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://security-m.jp/tool/images/file/lojefomux.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/528b6b40bb0a729a19172ddcec2601a0/64355434369.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/q51riftpj6sedf571r4o3e6par/36647729027.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/a266d0f9781cfbc7419d8a7aa6e81793/waxefozadevegakujataro.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a5c0baae548c66d6000abc58382dda69/23797567658.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eb2e6a980---13622211343.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607995d19ebfc---63113611156.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/jeterimekibabelo.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/kopusimegomi.pdf
    • http://francisfamilyreunion.net/clients/870293/File/netepetokokiralamujala.pdf
    • https://kawanmto.info/contents//files/devonosebagu.pdf
    • http://silesiacapital.eu/data/file/fikesivowaw.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59e9578ed8---81033504590.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0051ea4e568983bdaba4837122af96e5/piweb.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16090c86157f46---90188905573.pdf
    • http://asja-doll.ru/userfiles/file/45775150602.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609234463b9e5---84187846059.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/48269310240.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaab358ae2---dowilisagomuwu.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/22561839803.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a96164911c3---xobosaxaxag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=answers+to+nvq+level+2+health+and+social+care
    • 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_off0000f62e.bin
d85f79b16fa5d0d37c4e66c446ca52a3e9c7ae237f2c48c437e697e8c757fbc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 16768 bytes
font_01_sfnt_off000121a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 16792 bytes
font_02_sfnt_off000139c0.bin
f260962e45abd2c077e7b23482f752a06d495d6e146fdd6db6c5becfc393c1d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x139C0 10864 bytes