Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ae33e744971b7f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 23:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ff85208cd38b7ea0aacbb1fdfecf399 SHA-1: 547bba8b08b623531ecf56e586df4054370e0a16 SHA-256: c8ae33e744971b7f0ee24ce1f2978a8b658053a0882a6929787b6108a0e829a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://medvor.ru/uplcv?utm_term=customer+service+assistant+interview+questions+and+answers PDF link annotation
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff937c78a0---galoli.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/mojize.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/dixatotomuwubaguwejuwu.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/89665046545.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/08959a2c22658c0db4deb2675d6cfb73/tofinesipewuzudotiped.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a895011d3c---78626682647.pdfIn PDF document text
    • https://tempegaring.com/contents//files/71055293230.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6c20f13ab5c456eb4f8b8764397a73da/nurazanagolulazoxesufu.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/tosobasoxakaxin.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/46496389278.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/46257982244.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c812e49e---46893616817.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/muxolu.pdfIn PDF document text
    • http://kesifveotesi.com/files/18169656572.pdfIn PDF document text
    • http://balone.net/_upload/file///moponujogabiju.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/32664918929.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a658b48a44---tuvafalosora.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97e74a771---47755846293.pdfIn PDF document text
    • http://air-ned.com/uploads/files/56121890795.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/6978647241.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/besodepenazur.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/19n2sntrii0tt14ioscocn0jda/kijivuvutokudulegitex.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/39850728857.pdfIn PDF document text
    • 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_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 10916 bytes
SHA-256: 91ba0cc10a4b7d5e09ac9add0aa46d03c49504d460480b52eb341515a243428d
font_01_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 16976 bytes
SHA-256: 0d55019c9f4ee9d0e7a35289bdea517f691ea5cca5d1e069065d0ddf5ee7142f
font_02_sfnt_off0001303d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.