Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ca4c488ae5844a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 01:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c80dfb291407be1f59baf0bf1e987403 SHA-1: 5c4b5d9595c67a27c66268e4a3bd5243105b805d SHA-256: 38ca4c488ae5844acf784d3255df05d94f964c8e53a334ac6a0fb8de31f8ae7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple websites, some of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs suggest a phishing or scam attempt to redirect users to download applications. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://collectifff.be/imgdb/accueil/files/nixuwetinefimiwibume.pdf In PDF document text
    • http://aatmicscience.org/asuserfiles/file/xanobeb.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/41322982768.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/zisiw.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/45539748556.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/rolizusizajotonupanef.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/nisalaligejetuxulosofivuk.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456aad4ed6f---27079509654.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/29374383197.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9eb66df1---51185915679.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/vukakirijofegusede.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/wisesosotumegubi.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/36074422692.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/58768882408.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/93687336516.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/66246223345.pdfIn PDF document text
    • https://red-adlay.com/upload/files/mobadugugunijedoliregud.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f03ef542579f911a39dfa42dabf7ce4f/juvuvizowetowafolavamijab.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/kebomusidigezin.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/75645483539.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/83228693739.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/tutivemavelojesut.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/zubifemukipav.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfec01c15---nexawajatagapipuxedotase.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/kekakakenakaz.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/48548659598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=flix+tv+app+free+downloadPDF 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_off0000b9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E2 14916 bytes
SHA-256: d4682f3a8e4637048f434c842ef929da8130c87ab0f20a66247f8debd70df552
font_01_sfnt_off0000df03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF03 10552 bytes
SHA-256: 2575d97bc30005f06e661ab6781062bc8af80a12fe94c473b49ae17e9d82f38d
font_02_sfnt_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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