Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf39e0bc46271625…

MALICIOUS

PDF

132.1 KB Created: 2021-07-04 07:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2824812dd594f990d3e95e1832031195 SHA-1: 15e98378c56c1e8002b8cb79bfe794e81622560e SHA-256: cf39e0bc46271625f558dc2908c7bfb11fcf78d4402b00e5dc1a4044d277e0ef
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. The document functions as a link farm, with numerous URLs pointing to compromised websites, likely serving as a distribution point for phishing or malware. While no executable scripts were directly extracted, the structure and numerous external links suggest it's part of a larger malicious campaign, potentially involving spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9845

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/280ad4ee714ce5c0a53c09881ef30f57/wibesilefimibagaru.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a9bb5a59---bujofexelajotofuxamit.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160718bf032c01---bulolumo.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/fixurujeniwujibowafuvud.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/10949797790.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bo9geb97j1kak45h2uj8d9vm8c/wabixuxotofizomelefogo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4bfa72be21ee786a534cde3d65e4c783/nesubenukasagovaxub.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/41668954172.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/9h5lqms2p42rmvdh6j387kqf52/sagovofovanolezexo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160785d9481cfe---sojofonoludexexo.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4a43462aa0ea20ff4b102b8ab7f5c282/wepejijex.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/32758491595.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cd300227---72159582340.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/s1cplr8sf1saqjp21hvf26stm4/16868115146.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/sodok.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/23106131366.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/xatolupajesugiforig.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fccc0346---83899293079.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0gcejlk1khidcdntu4g6at8o74/pazar.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/xebori.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf09280cf24---folovekutiwesimigemezele.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b8224e994---89167834230.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/guwerezaxawili.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a36745e9af6---56462780120.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/giwinafuduribulum.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848b136f008---sigalajopelen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=balance+of+payment+in+india+pdfPDF 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_off0001a050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A050 19200 bytes
SHA-256: 9b133ccdeacd946909cdfb36af3178106eb1b0b1015e90ff2cebbbbcd1e6309e
font_01_sfnt_off0001d1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1F1 10680 bytes
SHA-256: a341e0653f9209f8c46ec52ae8a5fc0ef6e620793bb99d0e619ab45810c62f27
font_02_sfnt_off0001ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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