Malicious PDF — malware analysis report

Static analysis result for SHA-256 100c7ea021ccd2c5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 02:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 606eabfb19b5269b5706dc26df208929 SHA-1: e15fa1664768d746d1726ea91185aca50d275933 SHA-256: 100c7ea021ccd2c5330382907458f1b454e1f0f6370b9128e228a666d2c0716c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves tricking users into visiting these external links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irvinenott.co.uk/ckfinder/userfiles/files/49094719135.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170a52fd15---80942159720.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/gegomogixagugenufiduv.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/gijefaxun.pdfIn PDF document text
    • http://cartopack.be/Images/file/liradogopajakudazelolu.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/23409450187.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/seladavusudu.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/balel.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/78931022202.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/rikowinukotexo.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/rusotugimexovotovewojax.pdfIn PDF document text
    • https://funbugs.ie/files/file/waporolosunow.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109111749285098.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/65223129733.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ae9601dd834dcd19741027d885f3b1be/38877867103.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/kotepenaziji.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a7be2bd9d---ritusenotowowuxupuki.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/89735699889.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/77607611140.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/51327896129.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/27067183662.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/35675965877.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/78394705631.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/voxapegamilosidumuveturo.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/61915790064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tethering+wifi+android+tidak+berfungsiPDF 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_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 18136 bytes
SHA-256: a8ea5fb48c85bad070fb328d5d74d6b28f675380d443c6e2471f96b015b37098
font_01_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12091 10968 bytes
SHA-256: 6f68d902cf573044b85e30916b2e5455301aec35e4490d9cb0dadcd7a21285b5