Malicious PDF — malware analysis report

Static analysis result for SHA-256 58415e43c36a26e0…

MALICIOUS

PDF

71.9 KB Created: 2021-09-11 12:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: dd985f46908daba7ceebaa55423e4731 SHA-1: f5d5806cebb1c77a33c630049e6a6f0c0251ec5b SHA-256: 58415e43c36a26e0430f2f2aae7b94a5b6eead26e9741bb65a2d36b4e3f5f02c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The document body was unreadable, but the presence of numerous links and the high risk score strongly indicate a phishing or malware distribution attempt.

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 https://almoheetmanpower.com/public_html/userfiles/file/pikanat.pdf In PDF document text
    • http://llux.vn/uploads/files/wozebadaxitenagomoka.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/99373609193.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/takukomutamujegaw.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161384f9b1abe9---55597980266.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/nasisutomemupabibosobu.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/majapabetunarovenuxinezik.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/puxegesu.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/7669530942.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/minodiwitutuma.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/23310582828.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jexesenadogopulupid.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/44214673571.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/falifemonidigez.pdfIn PDF document text
    • https://autoskola-scp.com/files/94212326183.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/xokujomoja.pdfIn PDF document text
    • https://vzglavniki.net/data/file/41368415393.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161304c0fc7724---sozelivovi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/nhvulcnba9mu30e0pqoh203ahf/pamotovuxixalafaxepi.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/59430695211.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd303605c---60748271472.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613588757e4a0---95885871796.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/kovukurajixubulamituru.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/56546711011.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/39248936377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=wrong+turn+telugu+full+moviePDF 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_off0000ba35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA35 15728 bytes
SHA-256: 82fb69464912589e6cd7908f39dc73d89ffe8acb7a6d1b07f4973f95c814b58f
font_01_sfnt_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 10384 bytes
SHA-256: 9e89ff419c98bc3fb37723ef01744a462a1d3f2bb2359f535ea2fbeed1fff965