Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b58209baa35baab…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 18:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 830e1753b0dbe3b40cee5e8dc9293ee9 SHA-1: 8e295a927b67d04953b3eb06f132b09aa50f151a SHA-256: 8b58209baa35baab5eb15f64c25b4004e4c616269170f60cbb7d7c567b903054
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2991d3316c27d241c07f4c7c2311fcf4/17880077501.pdf In PDF document text
    • http://dinskayarealty.ru/media/file/94575940227.pdfIn PDF document text
    • https://33mobility.net/uploads/files/45723240177.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/36613927929.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/sukojiloti.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/13336916958.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631693707nmHB.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/80686089428.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/36179423173.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/sewatovopawo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd6bc1e4e---nukabiturizob.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/ladulap.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/38158426787.pdfIn PDF document text
    • https://riwg.in/userfiles/file/buxuzozamafabuvokeronut.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/ramazekosesadotonadotin.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146b31739e2d---27721814568.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/vigafobigapo.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/4976376358.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/vodadipeluv.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/zibamamoxasim.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/25713039129.pdfIn PDF document text
    • http://badgerhillfarm.uk/regojo.pdfIn PDF document text
    • http://opsir.eu/files/file/28380548742.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/22532802787.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/rajukisijijutuxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+scan+qr+code+screenshot+iphonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFA 15272 bytes
SHA-256: 84b9d94370ab62dae39c5e0e678f7d9059197723a20fc62d87721b9cbb292603
font_02_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 10788 bytes
SHA-256: e0b339a8df0042336d4798b8c0f14a58b6274387b811351977b73d126ff99c2b

Open this report in the interactive analyzer, or submit your own file for analysis.