Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82905fa83ac1bd7…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 08:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 125f713e039e12c13ad948c179260fad SHA-1: 228deb3146fe3feb3bf8727427e4221bff7ade1e SHA-256: f82905fa83ac1bd76dbe57452a9879c682fe07f0f1df4439d3bc2fb19ff2a907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://benthanhsgfarm.com/images/uploads/files/dadufuferaxorigilep.pdf
    • https://thailonghoang.vn/upload/files/76269459831.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/ziruwawal.pdf
    • http://hasanmasat.com/ckfinder/userfiles/files/navubotilenuxonu.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/bf8972c6fee75773e7a706b10acac71f/20868940727.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qdj25f780o8kr5uei9ra0irmat/17565346988.pdf
    • http://qdsenfeng.com/data/files/nevis.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2cb668bc7---74336671575.pdf
    • http://rayanchem.com/d/files/84350985766.pdf
    • http://ekopaczka.pl/imgbrama/files/xesajasolitidatotel.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hekqgmacg8n42tg2s6ub4b2jia/makowozibimonuvorikola.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a4c50cdd---felijigomimomunok.pdf
    • http://distributoram.com/files/file/11909446220.pdf
    • http://obraz-tlt.ru/userfiles/file/43244267944.pdf
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/48769124020.pdf
    • http://shengnabei.com/uploadfile/file///2021080413464145.pdf
    • https://needlugs.com/userfiles/files/1071543024.pdf
    • http://ciccioinpentola.com/userfiles/files/44031859466.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613405cc81372---66830743457.pdf
    • https://giustofiori.it/file/22039910656.pdf
    • https://festival.bg/fckeditorfiles/file/boxuweb.pdf
    • http://jevades.com/aircraft/fckimages/file/47822582786.pdf
    • http://tetrafluoro.com/upload/files/lexebevigixememujibe.pdf
    • https://dineflon.com//files/kedabefawusipuluj.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816da37803a---40935008516.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/679fabb59087e92b4231ddea6efc3d09/mawep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=uml+diagrams+for+online+shopping+pdf
    • 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_off0000cddb.bin
b49b5f663d86fdca7938a028be270b4b7a8aad060f20a6032339459f74464941
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDB 17084 bytes
font_01_sfnt_off0000f9de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 16792 bytes
font_02_sfnt_off000111f5.bin
b5b962448e422322ceffd718c0a0a406ca5e72ee0c0c73e52d5b5252d6e7f9f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 10852 bytes