Malicious PDF — malware analysis report

Static analysis result for SHA-256 a122c1da0f63b569…

MALICIOUS

PDF

90.9 KB Created: 2021-09-06 22:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8453473d4ab601f3e7a8f0e4462a1a85 SHA-1: 1d57c87ac040e895d4afe460da384905dfbb511c SHA-256: a122c1da0f63b569d0a30b9905094d0e67c81c40953cbba1f159414074bdbecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern. No scripts were extracted, but the overall structure indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aj-logistics.com/stock/userfiles/file/buwufidugaxozorubumufaw.pdf In PDF document text
    • https://aspirans.com/files/file/69843728023.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968e921dbde---tixebafitoruvezamonide.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/79616769840.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/kixofawagedewowa.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/33434129666.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210530112257.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/5456135004.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/0kbvlspqujd0mnfm313ptgt6uj/51793681045.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5e007a24---36708151756.pdfIn PDF document text
    • http://csp.hu/editor_up/94147785075.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/70117012731.pdfIn PDF document text
    • https://foulardfotografando.it/file/tukizoraxilotijafugirod.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/jozazo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/452623ae812ef59b4e1286c6cbd422fa/47416621043.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/92eccc9f14ced8d5ed438c04189a9e2c/60065729840.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/gadeb.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///fadovazetefixakisa.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/balujabotik.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5bc0770bb---85790840632.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/zapubo.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/22371672214.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/govabivimunalodusop.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/81115641759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=vba+worksheet+copy+after+lastPDF 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_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 18648 bytes
SHA-256: 05f92e7db54717ea8c1d988837ccf628cee9a5165650f1c5e315a143300355ae
font_01_sfnt_off00012bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAD 10784 bytes
SHA-256: c2809a25b44afc47dc06c4c4973a2c1344e5035307326fa762d5a5d0ca627bf3
font_02_sfnt_off000144a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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