Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ac7a0d1b042e93…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 19:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf68b06a0a8dd76178ccff5eaa7d4f61 SHA-1: 055e3e1188868bb078b361bd87fd1ae13083ecf9 SHA-256: 78ac7a0d1b042e93983dece0d8d430e961e06bfea855b062b1d8126be99f54a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern appears to be luring users to these compromised sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/04f9b62d0b62a32b9ad8f168b143e172/93514022968.pdf In PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/66299260284.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/38270829057.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85646618e---jaxugekatog.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139eff1ebcec---silewokozebabanimabipa.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/38421566649.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/9955537478.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/defesaguxi.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/derukamodi.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/gazetut.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/99253236317.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210902184657.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/61868898129.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/95112209764.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/76285705773.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/14927085427.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/wudobaw.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/varoxatizavavuxu.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/76231414763.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/952dd0d15eff64d17cc3e27b6f9caa81/32883779251.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/6227467303.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/94962918519.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/91080888731.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/jinuwiduwaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ymusic+apk+free+downloadPDF 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_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 10944 bytes
SHA-256: 99264e647f6e4716a35fe7fb08622634d023677be164596420b9e47a7011655c
font_01_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 17428 bytes
SHA-256: 77f4459521d8e5e43bbe638d0ab78f3a45b30293e5cea9619a3bc3b6e42b1aeb
font_02_sfnt_off00011c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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