Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d8092d0b28c8f8…

MALICIOUS

PDF

86.8 KB Created: 2021-09-08 01:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7946e239a6c61437df670c3958712985 SHA-1: 0bdfe237f32b6a2f5c84909fc428520924e3f358 SHA-256: 05d8092d0b28c8f819e951cf53e3302854f44e07b53688aa5f9821d84a2691b1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of these links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://asiadomainstore.com/userfiles/file/26282689031.pdf In PDF document text
    • http://foto-preiss.at/upload_files/files/56844318611.pdfIn PDF document text
    • https://activepymes.com/pub/file/vuparof.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/2042934680.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/tusexufadize.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/fefabukuwinodulidiwiti.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/49827521156.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/npsprttrn586kr28kmtab7ugec/89157605277.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092cbad16c5c---81074144870.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5833abcbe---17136288902.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebaf4acd90---nugizilufikuve.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e572b4375014a66327f380dcfba2bb55/siwet.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210620061333.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4da74ae27f---86091271193.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zinizaputewumusebudoji.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/riwewewor.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/xukisodo.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/64005303716.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/30321765801.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210807083350_z98hjx.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/19763925872.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/28241127560.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/92502751713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=histogram+normalization+pdf+matlabPDF 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_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 22864 bytes
SHA-256: 8c71335ca88e48de389e290e95659eba77a1d5d7d61ab904cb1ec0188681f63a
font_01_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001349e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349E 10900 bytes
SHA-256: fbd2e196e217d3e94261711803ecf474328e18f07977d59d0e7b173720e73f8d