Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc3bce42921f12f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 11:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe35ff84dda87580bd2c1f9922d4bed3 SHA-1: 11e74428277dfdf72976140d0e7358ee2fcc028c SHA-256: ddc3bce42921f12ff79d31fdd03c69caa6ef528f400676182824531820283b82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. This structure, combined with the ClamAV detection and ML classifier flagging, strongly suggests a phishing or malware distribution campaign. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://irlanc.ru/uplcv?utm_term=qualitative+content+analysis+pdf PDF link annotation
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/71ea993b8e013ca9381ab8366e0fd4f3/40663686244.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/vetimumita.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/11071623856.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/fifazetuk.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/llvuiq4el20bla52gej7k2o5t4/75173595729.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/mejofiwaziduxanunavive.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0b90492fde4cae457279c45f71eb0ab7/sibopevun.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/73e6fa303fdaf992b878f2cc026de31d/17740836498.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/57701912851.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/bowijusimen.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/10466294141.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/fulobizerisotixagijusu.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/gasevuxelikivoto.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/zakobivovidudaboda.pdfIn PDF document text
    • http://scarpatti.com/files/relilakonovoroxi.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/23937569970.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42361451835.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368124684fa---79653951750.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/sapolisozomujiwexajipobit.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/34006619436.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/lewuzonovubadijagaregepus.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/faxirutezotirizozewib.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/99904030005.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6kj6r94rakkjfmtmu6oh33p2l0/mukazojipapopudo.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_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 18564 bytes
SHA-256: 1ea6e4e19d77de898e3f38a108cbd4527eb0c5174901d706d23b0cc02fca2a3a
font_01_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 10852 bytes
SHA-256: 3773d92e050e61f86b62264d9ef8bde444acd5e4ddbe65fddd8ed79cb5462408
font_02_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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