Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5266769b2fa9129…

MALICIOUS

PDF

95.2 KB Created: 2021-09-01 05:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7577d7b603762c181c9015a243bef66d SHA-1: 97a732d27a8c8c5427ab28dce8dd9c7f9149e139 SHA-256: c5266769b2fa91295c75035e9752dc617c5728b78dfcb8c3a61ea645c6130221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://househouse.it/userfiles/files/tuwapujor.pdf In PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/85751783644.pdfIn PDF document text
    • http://budka39.ru/files/22483519353.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/mi2lidhth0aenhm77ps0pfpf77/tikizerelupeloto.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c2f6274a271---51038291260.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/rirulirowedowogofitawiju.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/lezugofofaravanimada.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/pazolotivivowuxavovekoxa.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612179a05849b---57187191718.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/277507b86e2b20050b811bc523546dbe/77478784160.pdfIn PDF document text
    • http://peoplefineart.com/assets/202107/files/20210731220342874382.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/ea77429f331920df1fff749b8d9bb92a/50510213639.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/60307297848.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/tufimipawep.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/3798048334.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/76984002278.pdfIn PDF document text
    • http://email-database.info/userfiles/file/napikiv.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/pofatawekuwesap.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e0bec86d48a12667e663aadb1abe327e/ranimobobesakoximojitub.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/723ad6ac3a5abda71d367a94c03dedf6/39873409979.pdfIn PDF document text
    • https://wagaskar.com/media/20091503640.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723b897cb3e---90562317381.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/31378725830.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbf3120dca---49884706769.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/mesewijozokas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=it%27s+a+wonderful+world+somewhere+over+the+rainbowPDF 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_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 17832 bytes
SHA-256: 383565201b095b9ee4a961bec3f1f378c18c23641b90d7f6e3eebeba9db7c65d
font_01_sfnt_off00013b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B99 10996 bytes
SHA-256: 6de558459b9126bb1445bc3785819d584aebd564912e24137969703e5af975cc
font_02_sfnt_off0001550d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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