Malicious PDF — malware analysis report

Static analysis result for SHA-256 4899757fad09f4fe…

MALICIOUS

PDF

85.2 KB Created: 2021-09-14 11:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c244c999bb1638a30926ff2a0719589 SHA-1: 9e74e55b2aefb60b8789303c603a870272f0254c SHA-256: 4899757fad09f4fe8d9b97fa7b99e410fd5c9b28dcc7fcd1a7485a7a9debd228
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to disposable hosting and compromised CMS uploads, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://defhjdr.friend-match.com/upload/files/32171478239.pdf
    • https://et-auditing.com/userfiles/files/pisilebu.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/lojupuredoralofup.pdf
    • https://naveenent.com/administrator/imagetemp/file/84649848950.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4341a1553---kadaditexugarupa.pdf
    • http://maynenkhiinverter.com/media/ftp/file/16078348518.pdf
    • http://www.allatpatikapecs.hu/images/file/1681587931.pdf
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/lugigovoterironoxalelife.pdf
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/vazatesupijitapopi.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebdc89355e---8690631412.pdf
    • http://dentalclinicbangalore.com/uploads/26240398590.pdf
    • http://pune-india.info/userfiles/file/sabovonoguxununugarad.pdf
    • http://kangmeideyiliao.com/uploadfile/file///2021091205091168.pdf
    • http://ipceurope.eu/assets/file/89267847733.pdf
    • http://bargiel.com.pl/ckfinder/userfiles/files/banozubakode.pdf
    • http://geojeoceanhotel.com/userfiles/file/20210906023104.pdf
    • http://rotang.net/userfiles/file/66835650589.pdf
    • http://dichvutot99.com/webroot/img/files/4661386001.pdf
    • http://amsuatrust.org/survey/userfiles/files/57229856864.pdf
    • http://youzedu.com/ckimages/files/20210905095136488201.pdf
    • http://mictrogiang.com/userfiles/files/13117690811.pdf
    • https://hinodecoder.com/userfiles/file/bamapedetu.pdf
    • http://effektfilm.de/files/file/36494173515.pdf
    • https://rachelrom.com/rescontent/file/3409628794.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/cqsiuq8cn8vqe3f6d1pb59fh13/muriromixul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+move+pics+to+sd+card+android
    • 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_off0000e4bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 16792 bytes
font_01_sfnt_off0000fccd.bin
4c127be858f30568b8bf12839ebd2547fd03b8ce26f6d25335e3afcd6c36745e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 19008 bytes
font_02_sfnt_off00012e2b.bin
8140dbc3d516ed3367f901b49e906f138d2e5b7460994e209b7516ed76200ade
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2B 10772 bytes