Malicious PDF — malware analysis report

Static analysis result for SHA-256 a741887dd0e07fa1…

MALICIOUS

PDF

67.8 KB Created: 2021-09-28 01:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 291bae52d57f016c745186cf8c3029a3 SHA-1: 8ba15228cf08b0d476b5a6fc1cedb3e919214d39 SHA-256: a741887dd0e07fa11624fb018e976cff8ee7c22d39f834b787930e65f2b11b4a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, using an image-based design and embedding numerous links to potentially malicious or compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://moyamoya.center/images/hand_uploaded/files/fesivoxoga.pdf In PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/rexola.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/8045290491.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/43286608936.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/32380535351.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614343e3eca9f---fumolegopesixolaberoma.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/votofasale.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96f653f58---zaxebufuvodujes.pdfIn PDF document text
    • https://securitydm.com/slicice/file/lumakupikoxijimexuzub.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/moxokupebofawopa.pdfIn PDF document text
    • https://digireg.cn/upload/kiwurepatonakumimad.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/59165612011.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/juzonegavu.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/wurojokekagaxakir.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8f961285335c6ed7b56024c4f7bc6be5/49755237663.pdfIn PDF document text
    • https://trainova.com/userfiles/file/xinofoda.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/94189416881.pdfIn PDF document text
    • http://zzquansu.cn/d/files/tezuvinaxinerupovuz.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/21766666005.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109232236028905.pdfIn PDF document text
    • https://eslms.com/userfiles/file/83473030873.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/vakobuwezelad.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ddb962d61f8105717932ba5cfa0c40b9/dugozizoj.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/vemokujifugofinap.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/luvepusixal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cities+skylines+full+mapPDF 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_off0000af8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8C 10636 bytes
SHA-256: ae0246ad283df092cdbdbbc92eed52374facb6b8e88d2b30df5ce70d00f5a864
font_01_sfnt_off0000c7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EC 13760 bytes
SHA-256: e2189671b75958cbd3bd70f93d6b388472bbe22dd089986265e7ecdb8655af9c
font_02_sfnt_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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