Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9f208965560da3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 06:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e30f94b4b7d6d73f6c716f8afd4f802 SHA-1: cab6fcfdb211127130a1a01a88749955d3728541 SHA-256: 7c9f208965560da3792544f8b63b2a86959b11d40109ea14d46d6626c1e3c5bb
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of these links suggests an attempt to lure users into clicking on them, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://living-stone.lu/userfiles/files/46160503949.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d552faa9df---61273657619.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/dafekapuzoku.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/fewete.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a2e123fc7c1aa1250247b8bf5be8fef1/nesidagofupeb.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109021237568344.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/5880032944.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/11692746055.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/pcnb0hssavoct0lpqf157abm83/juwab.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/gopigivigivug.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/5225014094.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210911175659.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/42335926528.pdfIn PDF document text
    • http://ativn.com/upload/file/14582146266.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/12633c0ca22ce7fe4faa3cd96f6bf871/supefapa.pdfIn PDF document text
    • http://farashimirooz.com/files/luxezebujeb.pdfIn PDF document text
    • http://ch-yang.com/upload/files/toneximiva.pdfIn PDF document text
    • http://ombs.ru/uploads/files/sazuzid.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/56403365920.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc18a767ab0f52db639bc5cd2a1044e1/79396472596.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/xinuwa.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/77927641696.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/timefix.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/vavekiruvodanogej.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/60849729044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=jcheater+san+andreas+edition+freePDF 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_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 18292 bytes
SHA-256: 6a13b6a623fdcd81b808cbe644e5c7dcb1df0ab99279c0c84bf2e8ebfacf862d
font_01_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 10516 bytes
SHA-256: bb55323cee3a0c5d817894275c90bcde839b1b6ef3c6b5d104c9a8f025d57c5a
font_02_sfnt_off000129de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1