Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ec353cee84af94…

MALICIOUS

PDF

81.1 KB Created: 2021-10-08 00:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1dd04e16c1df046d1307497cb15f4690 SHA-1: a82ead3913d33113dde4b66c98a19b33ab7558af SHA-256: 66ec353cee84af947719c26655106511013159ef0ee85ac65185673f1639226c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The PDF structure itself is also flagged for containing duplicate object bodies, a common obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://drafthe.ru/uplcv?utm_term=going+down+the+stairs PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146e3b813a8b---paxotomolunozil.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/89544479570.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/2970323015.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/gukaxukikokulo.pdfIn PDF document text
    • http://master-br.ru/img/file/kitosepizala.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/90103323184.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/23a79d8b757612ca00d9288f25e1d01b/56661904220.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/navupebotizofononawimase.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/51890724770.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/bazejenajilax.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/24703656156.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/ramazisisokal.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/lerudafelidusidovor.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/zidesolulil.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/pabakikufopunope.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/nuvunemuwibupi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16149256cf36a0---riwadopaboz.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/kekomofuwufanijukulef.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/wagifux.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/fabonuzed.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/tofusilukosevalaf.pdfIn PDF document text
    • http://fitviewer.info/files/file/17606508996.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16156576958fc2---kovaxutoralulexofusipokeg.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/dibixexoburuwubaralusuwes.pdfIn PDF document text
    • https://sapporopools.com/contents/files/xawopug.pdfIn PDF document text
    • 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_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 10604 bytes
SHA-256: ad08d287526c8cf90757a47fca2f43af73fc5a6911814ae000c1525d04dc8ccb
font_01_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 16908 bytes
SHA-256: f63a9ce12b7e3ffbc3479fbaabd556c9b218a9266d63c4254bae5a6bdb2b79f9
font_02_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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