Malicious PDF — malware analysis report

Static analysis result for SHA-256 d681e22c3a73fd5e…

MALICIOUS

PDF

73.4 KB Created: 2021-09-25 06:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f2488bae43b18c6958d0ebc9a003c8e SHA-1: bc69b987de88d1ca4ac0e7a9b9c17a838371c16e SHA-256: d681e22c3a73fd5ee5f0bd175f6c4bfc207fdc0bcd2ad39ed5493cb59bed2617
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains. This structure is characteristic of phishing or malware distribution campaigns. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://adbrf.com/files/fckeditor/file/46659885961459bf90b92b.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4c6jo7dhngg3pg3gon89np34oq/kagiladibesavogeromore.pdf
    • http://sobateracota.ro/mm/file/xifamam.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f2dba234b71969397a42f24862eafe4c/topabemakiz.pdf
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/5544475669.pdf
    • http://z-sinpro.com/upload/files/14790613058.pdf
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kusixeralaxufoze.pdf
    • http://internet-trade.eu/UserFiles/file/25084809047.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a8f9d4026---givazatiwaro.pdf
    • https://ocw.tw/uploads/files/rovatolozuxegozokoxewaz.pdf
    • http://byty-pardubice.eu/UserFiles/File/629654375.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161436a2c26fe6---zafidexamavabojojeleforid.pdf
    • http://geobigoni.it/userfiles/files/45878560926.pdf
    • http://5lovestartw.com/CKEdit/upload/files/17981170928.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146033addcc0---97616405558.pdf
    • https://tourgardan.com/basefile/tourgardancom/files/wozewekubiliz.pdf
    • http://symbolfoods.com/files/file///zomeligeridotig.pdf
    • https://evrenmentese.com/upload/ckfinder/files/17675544340.pdf
    • http://erdbau-rauch.at/zafiv.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc70d9bb58---88708318099.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/54330136738.pdf
    • http://meghdoothsuzuki.com/uploads/19982901096.pdf
    • http://yogaschoolofkerala.com/photos/editor/files/73931146091.pdf
    • http://giadinhmedia.com/uploads/files/13559982491.pdf
    • http://vegman-kzn.com/ckfinder/userfiles/files/96621569720.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=change+mtu+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7ac.bin
d6e8b45a60c6fcac338fae77278e4d503138e81d748f89cb395ed171e597dd7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AC 18732 bytes
font_01_sfnt_off0000e885.bin
4c2e7dcec669059967a802711dd26c0ab5c773b30bc64099b9c6054b57cb7e10
pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 10612 bytes
font_02_sfnt_off0001005a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 16792 bytes