Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c685cc0f41d2a8f…

MALICIOUS

PDF

97.4 KB Created: 2021-06-28 11:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8551cc320ee8e792a644d8b5e6baa80c SHA-1: 00a429480ac11af8830512e21612bc882e017ccc SHA-256: 5c685cc0f41d2a8f4e19c210e710f2f46129c203d8bd29d9fa8d4e55ee8136db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous compromised websites and disposable hosting domains, likely to distribute further malware or conduct phishing attacks. No scripts were extracted, but the structure and URL patterns strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inlygiaylynhua.com/upload/files/56823318663.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8fc23c2fb502570b42c1015b094195b0/kuwalotariwozeb.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b73bb2896---xusodonerenaduzaxokupit.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734f06532fc---kegoxefugesilimi.pdf
    • https://nonbodepsg.com/uploads/files/vodivapaxitezas.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e0523c9cda33ed362fd413ba6986d379/tasigumisanosedazomeken.pdf
    • https://cubic.is/userfiles/file/zelajuxusenedinunivo.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/93094295720.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad5b59d29---1337668114.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/hllvv002ckge1ogeq04kmqj0p6/jewive.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/89hb63eppov35llshj19roqcps/18796561281.pdf
    • http://teresachild.com/upload/files/19687378033.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61f22d1d42---fukusozidob.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19d8fafaeb---noxetor.pdf
    • https://kede.org/userfiles/file/dezuxofit.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077b51fc1254---35224869023.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d5de6714---64035677990.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ed444e59f---lelozufebowasu.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/070a6jml3avr6rlifoqob11pue/kumofesatuf.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777a0d85ad0---78328497049.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb50b24ef5---25208322656.pdf
    • http://7seapharmtech.com/Uploadfiles/files/dabinava.pdf
    • https://btcauction.vn/hinhanh/file/64879257599.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=hobbs+and+shaw+download
    • 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_off00011954.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 16792 bytes
font_01_sfnt_off00013166.bin
74928ca6d2701a79f7884948f8866538eaf99c379d02b8a5db13da88ecf1fe26
pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 18552 bytes
font_02_sfnt_off000161ed.bin
335b3c2b14dbbd9ae599c271a71b1ba251597bc15e933d6c98e772aecba009d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x161ED 10140 bytes