Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a5044c0589f5c4…

MALICIOUS

PDF

104.5 KB Created: 2021-06-27 07:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1839f94a1b56a07d9ba73c21747a92bc SHA-1: 1d752e1d342a1a3bc80b53d68f645935ffa5657f SHA-256: 17a5044c0589f5c408a73ca685c23677cbbc4dca9e41b8dd7b6d56f101fcb7cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The presence of embedded URLs and the nature of the heuristics indicate this file is likely part of a phishing campaign or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://autodilykanka.cz/cmsimple/images/file/gubuzo.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a271c7b461f4241d699803e414ed6358/52721384365.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/30930515068.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b61961e3d46---17937161856.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/5bfa0286d98b9912d90e7ec8d0ccc80f/simisal.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/tizumebit.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed07739524da2e1fa5d76abcd03a175d/meruvetewadipuzive.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f476be834c---danogerefaj.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/retefe.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/kafelivozaguf.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/52567253937.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gpmj4tvskg9aen8n85iuq9h6pf/dewojasaror.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/bibavotebekusukisaz.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/97fbbaf830a26a9516b3eafedb620751/43044415347.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/md61jpa3vftd1u3ipk7u1tj9l7/dexuralisupu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428140021155.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/46302276272.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b2f90fae2f69ca287de4a475b8fb3dc2/58472671494.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaa3411dbf---8751431508.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/51320423701.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/8161257321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=psoriasis+and+sclerodermaPDF 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_off000134f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F5 10436 bytes
SHA-256: 772a1159f4380a44d7b047da2768a437764c3ab99fd05362bbd939a69c967c72
font_01_sfnt_off00014c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C88 18440 bytes
SHA-256: 2f763430b87f72a6cbf2568db5c24f12c2990395c400a59110465aa7e594247d
font_02_sfnt_off00017cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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