Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc69a0245ed31ff3…

MALICIOUS

PDF

77.1 KB Created: 2021-08-19 06:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5e1c45247b312bc6886007bc9bc507ff SHA-1: 2871407dadc4a37ed1ad4a18b2e49290da5eab7c SHA-256: fc69a0245ed31ff3bde63277b1655f7ed0504717d9f93879c39ca17e3672d9d5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093425d77beb---87466898648.pdf In PDF document text
    • https://wagaskar.com/media/tafemutofegezubuwazo.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/25943287301.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/zorosogirurufaxexowuxud.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/mezerakufuw.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607870aa8eca2---vibamamazorumabadanego.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/fedawuruzikezubefema.pdfIn PDF document text
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/vebasefob.pdfIn PDF document text
    • https://alpinashop.bg/files/22003023863.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/31029827855.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/64111537366.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/kukosek.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/wabulagiv.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/jimosonorewoz.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/kavuzojesasinizesepiserif.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2a8e2ac36a7b4f84d04ca2108854edc9/24539226765.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/44146655615.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/nizetokaxidepiri.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lnhrbcsovgv56t617g1f18pjh0/damobekibogul.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/craf1lm8visofgg6cim0m0c4ir/85274041652.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/dfc478b445061835e703e266ae0337b5/sunib.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/10890606668.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/40106651910.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/lf1j1fcpfemcred466sbdae1od/24774134349.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/liggtbrekuo93eg7j630n24f6n/tugaj.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/sanazimebeguxanebitekom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+reset+toner+on+brother+mfc-l5700dwPDF 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_off0000c7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EE 11044 bytes
SHA-256: 0a5ce12980dc0bbf5605616e4fcc7dd19390cf34ba9614d4ab1b9a019d4595aa
font_01_sfnt_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 16980 bytes
SHA-256: 30f4ce12c29eb63ec5d923d0061b30f41d3602ee28767e8546087793461dc631
font_02_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1