Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e4f3c094d0ab27…

MALICIOUS

PDF

97.5 KB Created: 2021-09-16 08:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30b67b94b8d1de2a15dd4fd8ba6d2ae8 SHA-1: 049afe19b50f7e2b89a926fee26fbad268748622 SHA-256: e1e4f3c094d0ab277f293d5d16ffe91d7a8a42064e62f4c6dfdbd328d6a65e49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML flagging as malicious, along with heuristics identifying link farms and compromised CMS uploads, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://laborke.ru/uplcv?utm_term=thoda+pyaar+thoda+magic+torrent PDF link annotation
    • https://sunnyrosesschool.com/userfiles/file/29766547187.pdfIn PDF document text
    • http://i-dron.cz/data/file/zetivabovenefamusulop.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/87554594442.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/54631610933.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/50204143800.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/72923252094.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4057c3d0---tazak.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/pukogifixig.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/61970374832.pdfIn PDF document text
    • https://norservis.com/files/files/91590422853.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/qhbfv3r5ap9qbrpgc63tqs1ge2/65447737472.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210914_060946.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/zusojudanot.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/rupuzobofag.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/rewadomatak.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/kubopakudeweruzujosibula.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16139e26d4fb18---20942693992.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/kifegigi.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/51926198857.pdfIn PDF document text
    • http://firegallery.ru/img/upload/vizikupoxolivomifeke.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/46089107607.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/61686729848.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/pufopubirivodujadomuvati.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/33097818257.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/suluxodufupakadiwefele.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/85173120891.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_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 10824 bytes
SHA-256: 36f99d1eeb5a2b76c316a2fb0aac60756afe6d088beeaa2d5ced1c688de42870
font_01_sfnt_off00012f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6F 18432 bytes
SHA-256: 22a33d427e8c2a772cc7ec616f0c2518fc2bd36075c93938668d3beccc74f7a6
font_02_sfnt_off00016013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1