Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd561c47dc2c1b40…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 17:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4e19c26916653cb059043d965b6e48a SHA-1: 3f7a485e2749b4dc0d8e307a00a3e649e0687c51 SHA-256: dd561c47dc2c1b403f253e5d7d6bda0510b0e2a476b6c6b32308ed15309d61c4
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are likely compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm indicators strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gruppocaminiti.it/userfiles/files/37406861911.pdf In PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/29580901752.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/7dc3ba627a7af6cf37aaf626f846e57a/dimobekibejevupojofilate.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/dukes.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/99936747093.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a071a04d063---sonepibivegavatokun.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/bojunupunuxojelidedop.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/35738436487.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161035b2ada140---bukejune.pdfIn PDF document text
    • https://noddy.nu/images/file/1406859694.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/utj6onqs0cdiskaq3thvud51s1/72296615006.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/83d2d7f52181f2c511aa78fc1f0340c9/70803661581.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9e9ea8ef15cdec31c2d38fb4ef495f64/99681141363.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/23112b80bf602d85eb61995bd7184e0b/zifisepo.pdfIn PDF document text
    • https://izr.fr/files/tefofatiwubawe.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986158ad0e3---44727336668.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/14634779869.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/fosuz.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/23869201802.pdfIn PDF document text
    • https://baglab.pl/galeria/file/powazesakinonamamekul.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c27edebd33b---82374968836.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/rv88o5iel9hkgqn7ekcrc3caiq/50222272633.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/57215249458.pdfIn PDF document text
    • http://immopolignano.lu/images/lexonoriwarititad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nordictrack+heart+rate+monitor+watch+manualPDF 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_off0000bd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD08 16368 bytes
SHA-256: 28345a85eb2553ebb2e15245354304bf1df0fe517377608df1edd1d385038fea
font_01_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 10724 bytes
SHA-256: 7b2d0d2f9a4deaa5517663d64d16fcaae5dad4942f8cb91946a428875996e235
font_02_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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