Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87f22d6d6a26452…

MALICIOUS

PDF

84.8 KB Created: 2021-09-21 16:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43ff8611d60b9d2c5813ffdbb0f19950 SHA-1: 101166c6ca96780791869286fe2d5f8714046920 SHA-256: f87f22d6d6a264529fcdd6dbe04ffcd2bc3d9430da23b38534bd37e60a8489e6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=sword+art+online+progressive+volume+5+pdf PDF link annotation
    • http://pasted-radio.de/web/files/60401593467.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109071102501236.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffe25c9711---javuwogi.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/wovajisudinofotuluxusel.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/litivozobemevavusosif.pdfIn PDF document text
    • http://canvangdientu.com/images/file/gemesexugotapizuze.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/ziwinitora.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/6316870419.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/lakifun.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/5622163081.pdfIn PDF document text
    • http://poiskvod.ru/images/file/50068896978.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161494d9a8d16e---45120453757.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/tolovatemajatanimotizego.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/15624114197.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/gafupe.pdfIn PDF document text
    • https://alohasafaris.com/files/mizaromufuzaxigugonijusu.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/ginesowawuzuforeruwanur.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b97823bac---muwunagop.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/sutugevelitivozabesapule.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f81b124592---10898805449.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/tular.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/74710522739.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/74693218795.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/24866635516.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/52624346146.pdfIn PDF document text
    • http://cityfate.com/files/files/xuvaruwuputod.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_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 17540 bytes
SHA-256: 07b71b4dc597b5017e5f1daa02f156c609eb04610304cf6e5195c1b14ec0424d
font_02_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 11300 bytes
SHA-256: f092e9c27459e170d1eea2ea5e202adb769868a2d3d0824188eeecf4b1cfc427

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