Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc80e88ce192685…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 19:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38bb6754e6fc6961b6595ce0028cca59 SHA-1: b0b5e2f004f31ca0865cfa3637d8c02acd4f2452 SHA-256: fdc80e88ce19268506e7533cde218e490eeffdba1c26c670988904a9c3445218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests a link farm designed to lead users to malicious content, fitting the pattern of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://forumsevens.com/images/file/rixafonoxunutobumet.pdf In PDF document text
    • http://mt-filtration.com/uploaded/file/1915913021613bf72fb233d.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f1496d65212bd3f8abd22001be1c6d5b/xujuxutix.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/ximoxorotobaxitowotap.pdfIn PDF document text
    • https://kimcert.com/E/file/gituselawed.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/bagexemibibigivof.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/zuxeguwelipapofofive.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/41473263158.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/gotitiropubixig.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/rukiwedanuduvuvaziji.pdfIn PDF document text
    • http://namngonviet.com/user-/files/59531090653.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/lanikuzevixewapukipevew.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/68352170620.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/woxovimop.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/88641072889.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/rakobudetaxolekukusagof.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/12461619896.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/aqumif0n03tsfpus26d6qv0l21/lubolotida.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/vitapefig.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efd2b0bffe---71103816546.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/18399149485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rubiaceae+lower+classificationsPDF 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_off0000c827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC827 10700 bytes
SHA-256: bf99968d8a7b34c208e4af786b9be465e8a624b56e5eec4104ce46902875ad2e
font_01_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 18152 bytes
SHA-256: b818fd4022c46e9bdb45a0182bf7c8372099ca9f5681868346b374d3411ce4c8