Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a54c71a213fc1d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 07:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ced4f1e7c3b111ef11d0a0358eaf08e9 SHA-1: ac1e39cb0005f45c67d2f86a5fabf262e4897ca4 SHA-256: a3a54c71a213fc1dc902a68d85b1f96ebec9d98644bfce6d398dcfd87ea80724
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure and an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ff2329737e0b7132d591dde188dec77b/busuwikitar.pdf In PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/0b883ff38f2c813d46ba73aa8e0c53a6/90336187433.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/1280235982.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/40727057277.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/f9r03sjk03hc7ilinbh46471pv/46344034495.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/nafuti.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/gobawakore.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f631cbe9d2f6b180290a18adb696bde9/wujuz.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/76905062139.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/xovadofila.pdfIn PDF document text
    • http://fittbike.hu/files/file/66536106731.pdfIn PDF document text
    • http://midel.me/userfiles/file/nisifetumoloj.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/mofudevu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/govolonewezidase.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/pbme81gmdfmej6m20pb1u1nq0m/93246089512.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/2719439662.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210801041335_cl1z4o.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7e156502d---89585431396.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/93502806575.pdfIn PDF document text
    • http://stevis.cz/files/file/50953870168.pdfIn PDF document text
    • https://quangcaobienbang.vn/upload/fck/file/51951033717.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611be4652b9ed---levibedadoxex.pdfIn PDF document text
    • http://chromatographvials.com/d/files/rusirowa.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/63000411603.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/60042237937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=navsup+form+29+pdfPDF 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_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 10616 bytes
SHA-256: 7cd6e9eb893a9ff15aa1a74c126c1c15786dabe3bf9b11f0db7ec4c72974ef5a
font_01_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 17664 bytes
SHA-256: a4719f09d5e342bb35641d568f33140fc4754a49f3910ea5f6260a239910104a
font_02_sfnt_off00012f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.