Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bca0ae0b061b11…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 07:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a2662744e9b8bf07b97fbceee2258c47 SHA-1: 9adc0455f5cf3a42022548a0c3528a7683e7c472 SHA-256: 97bca0ae0b061b119ce520f0023e8e5965eebd5e8cbdd75ac14908cb81933915
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this attack pattern.

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://makaroma.fr/upload/file/75625219330.pdf In PDF document text
    • http://plantessentialoil.com/upload/files/nedupifur.pdfIn PDF document text
    • http://hodori247.com/uploads/files/jujujubojagifidijisusuguj.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109130234116143.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/99888851420.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/5r3b0hfn32eo26se0kc9aqqr93/xuniram.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/24329861760.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/xuzelap.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/3412745412.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/62541735509.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/e8a8dd99d952c389fdb96bafba8804ab.pdfIn PDF document text
    • https://stotex.rs/files/lupojexi.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/sofiw.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wezek.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/34636626914.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/xixuxo.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/lalovapusuz.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijowipevagajibufuxore.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/zarevokunodukibixo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c64f91f5d90a8ecb2c7553557835201/pixosu.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/vasekebodiwaluzusokegi.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/31748577080.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161300eb169b49---61107486760.pdfIn PDF document text
    • https://mkontroll.hu/File/23515556805.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/38330465743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+spider+man+miles+morales+apkPDF 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_off0000b519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2B 16604 bytes
SHA-256: 040fb02906d6bb3aab113d2a9130a3d71cd47e109118e9b2f3c9d1ab26396960
font_02_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 10636 bytes
SHA-256: b6292fd80c78fe7605733e748ecbc86d20e7397ffff3944c8a11a4ff0f9e9700