Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf563cfda70a398a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 00:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5336f27b973f5b92810c4b1e734c8d4a SHA-1: 0caf78c17e2137c2ce045a2275f1075576f72121 SHA-256: bf563cfda70a398adeb96d4f96f14e09dff67dd39f8b14c2cc4fdfe916eb28d1
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 https://pistant.ru/uplcv?utm_term=mahagenco+question+paper+pdf PDF link annotation
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1abd184ba---68753993779.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/v9q55kp2g90prldolf8f0vkcm5/39945414309.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/werotojanevogokoxagusuteb.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c303430ae0c98fce1f69087b3c8b9327/runumefudokutusegusu.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/gagaxoxesiletepener.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/25495981921.pdfIn PDF document text
    • https://digireg.ch/upload/toxoli.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/cadbbbf29be7ad20e47ece68d4b221a5/kudovasubajebodedofi.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/popejovekiwanukusi.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/22/file/20210522_220925_109.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/86555286432.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e6310926e687dc78b38b84f56e89c092/dunipodufoti.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f83ad66949f---rebaxiviloxutunes.pdfIn PDF document text
    • https://italvaping.com/file/mabixovusudojapogu.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/sifaf.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/nixiganusarinusugiv.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/7066221203.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/zozabeli.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5732cbf80---33505176626.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f637d73d6---magikanazegifibopu.pdfIn PDF document text
    • http://ingore.cn/upload/files/soxer.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/49738008317.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/vitavapozumoratese.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/pukixekopamasi.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/bigekanetozapado.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_off0000d539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 17480 bytes
SHA-256: 7b15af9873b579cae5c9774cc50ab99731c1ee77b4772cb29cc620256c8ee53b
font_01_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEA 11092 bytes
SHA-256: 4bc9ccd3aeaad4311a5f55f269e67e6d4eb2f515e9833d7002cd04c69ca8e1d2

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