Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef1e7d88175297d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 09:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b545fe4a9f82eacee66c5747c85dc92 SHA-1: 2442302d401367dacd9dce511011b2906c2c5ff7 SHA-256: 7ef1e7d88175297d681f684b3ebe78ff1a64cc7891c81182e2f273edf0cc7c18
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://chcial.ru/uplcv?utm_term=funny+self+obsessed+quotes PDF link annotation
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/xavokali.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/kuponitupon.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/dowitepepami.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/girakukarodoz.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vowomodexobofevigiz.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a09c016020a92f4b477b7599fa77a8a6/16980997017.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2c6d9011---xobabibulejijome.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/ziruruxezaximuj.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/buzenovupezesonikum.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/53249299301.pdfIn PDF document text
    • http://korytnica.net/data/files/20539982176.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/fd53ca64a42b34bec854a08da8ea8414/wobakovorimarafo.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/gotifesok.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/60554470459.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/23618608162.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bpjbb3l6isvr7dalncckqi6dmd/58106213216.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/98230440687.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/70639444127.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161427f77e2f4c---wuzofulipoxelopumaxibox.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/pikoferakeselari.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/26487764214.pdfIn PDF document text
    • https://linardi.ru/files/file/58356106396.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/vafonutorefelabiwujuxexi.pdfIn PDF document text
    • 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_off0000dbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 17328 bytes
SHA-256: 73645966690ae173e712f83955cfbfa3339445cbbfb5306785ca5671b351774a
font_02_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 10468 bytes
SHA-256: a0fb8f643d6e5e4adef05b1c35fce3ba8c21f2f657d24a213c23e8b37a7b520b

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