Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6be74937ad3de0b…

MALICIOUS

PDF

96.0 KB Created: 2021-08-24 23:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 788219b8eb850746606484c3c389179a SHA-1: 6551999f0830c16a75b1f7d308f6d9b29eb30e84 SHA-256: d6be74937ad3de0b9dd88f9993c4ebe53e85c31f5b241dc17a9a4d1d6f78c7b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ded71b9bb62934c9b19b619e1b41debd/xokatifib.pdf In PDF document text
    • http://kuppersbusch.hu/userfiles/files/gekabegaluwalakategulinom.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/xogulowaxaripenubalonoj.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16094c29ebb00a---mefutewavat.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/4221204867.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/nebidowuwesazasiwo.pdfIn PDF document text
    • http://wwsm-us.com/files/file/70667636821.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fd134e9d1c294e87625aa488808747be/feziz.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/j67tl8vugoi7kt46bpoaspl7s3/liwub.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae2786ad1---rijukiwerewadakepetofi.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/jidelaruwasejekujasa.pdfIn PDF document text
    • https://educhina.mn/editor/files/8184717732.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/sanaxixirisomul.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/k4in8s19f7niava2fcv4ugukqh/11289891426.pdfIn PDF document text
    • http://pk.mo/userfiles/file/sajumimoginuzuge.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2e2n7alj9qpjinhaisecka355m/7179118253.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7796da59308744525ada6df4415a7fe7/jefovodevukiputegi.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/m6bv42fi1h196lndijol38q4v8/giwakopowud.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5e1db436e---50598952928.pdfIn PDF document text
    • https://icbacademy.com/upload/files/70150870844.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/7273581876.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/83627476427.pdfIn PDF document text
    • https://sinarwaja.com/account/files/rivefonopominisojetipon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=owsley+county+kentuckyPDF 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_off000113a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 17696 bytes
SHA-256: 389cd2d47bb9af40b98cd3cca191c4f8ec918490cac3b4d29b13ef8c0e558bf6
font_01_sfnt_off0001428f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA6 10288 bytes
SHA-256: 06decff936fb8b9b5aa53a065561b83d265e7caa75dc9f111e37df6e1994400a