Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff619dd2f0ac7535…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 11:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c27b4c789cde18e18dd6346238bb6f7 SHA-1: f8a1c5a263b419c98af6cd18b01c6ffa6a815d1c SHA-256: ff619dd2f0ac7535922474c970abb21a6ed51c91b618424ef7bb7b941a0396f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many external URIs pointing to potentially compromised or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://deaprogettazioni.it/userfiles/files/9138736267.pdf In PDF document text
    • http://af.ssla.ru/images/fornews/files/zevizijawelop.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e19eeed3673328863fdfeac4c47de4fd/49102514482.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xaborikokuxuxugivazuji.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/86145977873.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/63943919129.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/39593579206.pdfIn PDF document text
    • https://digicpictures.com/downloads/roxezo.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/bebizumugo.pdfIn PDF document text
    • http://torgoborud.org/images/file/bugipolesevewejazebuweb.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353eb36943d---49886071196.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/dapaparojuvevuniwulufane.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/nudoboja.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/864084318.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/zosirug.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff454d0f65---posudaralavo.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/43256362805.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/keroxi.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/26179574515.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/25161552584.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614907a1c2f6d---vudotavudatumefuwoturepav.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/93518509749.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/kijote.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/mazur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=redmi+9+latest+price+in+bangladeshPDF 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_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 11192 bytes
SHA-256: 161b702f7489c742351a22858cda2133f7090d72b3cbe8ab9b020878d370352e
font_02_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 17916 bytes
SHA-256: 394a8c8ce22d0864155d3e4a57ea7fa9bf49596e34ed69676cafce958c2ce6ba