Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ad94866b4d79fd…

MALICIOUS

PDF

81.7 KB Created: 2021-08-20 19:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5565baf5c2a2f0f447e02e6c1e17d73f SHA-1: 36ac76e34ef5bfdaac9d4752f88032246a7276ee SHA-256: e8ad94866b4d79fd986386c00e01abb611c82d53d06d662d4d37c6551286f257
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload storage locations. The presence of a visual download button further supports a social engineering lure to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bea31429d21---pomozufanisigagusofebimer.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606f346ee39f4---42186761732.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/pilamorujewugafamexofi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160db57e7ad3fb---bapuraxulokemiwaxipirega.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fe0e9b8c9677cb5296483a405fb4e9ef/92902558967.pdfIn PDF document text
    • http://lg-palette.com/upload/files/53726719580.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/venijosijefetuko.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/94328954000.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e766069f2c---kozivaditizoximomupapubor.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c547bb986bb---17715720075.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/nigukutibuluvulivibamabi.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/rujulopuzewolubivu.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/jodumi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8b6585bbe---tiwarulugonelemibifas.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16113bdaa7a8aa---foxarejabawalufu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c539c25c55e---6604960219.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-6/20210506030815767764.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af95ff2cbf4---tapixefix.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/warod.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/xazenidagiwizovibof.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/70896456502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=businessman+2+hindi+dubbed+full+movie+download+480pPDF 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_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 16624 bytes
SHA-256: 5b3fa9262c5b7ba6fec2f0abf18a02ad2b6d815a72967243aced76187e57fcc3
font_02_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 11536 bytes
SHA-256: 44d9b4252caf90323f6d1d100bfb44e8e95a29ece7d8ae470963b67a323c23a4