Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a00a17565939de5…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 07:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 884af8728efe31a976bde8e6f2b6f856 SHA-1: c0232910f8bd745b7ee0806cd7a09c2064455dff SHA-256: 8a00a17565939de5e431ded23756974a9e754c2a5b9e54de33dbb07533b7b9bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The primary attack pattern observed is the use of a link farm within a PDF document to facilitate initial access, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/5dc6137adeaccf02d1079f224b9f0338/1333811935.pdf In PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/xigofililafem.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/7fb63d6c69863412318cb256bcb93330/xupitosibewegijikusifebor.pdfIn PDF document text
    • https://ksuskalology.com/images/file/faladozibowugedujene.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/61729639665.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/35460011682.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/44975155290.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/vamufigawumesik.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/49472095185.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/3lqgfqpkk56461aatesgrec6o8/xoberavonegido.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/337951603c6c25822bacac72c676a637/vaxozasuwoxu.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/65110535801.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hlinqjn1jvqk392eh8tue0pk6i/venopep.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/24fb9c576ac9e1ebdb9911677ab889d6/sefigofepiwidu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801cba4eff0---25351135659.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/sefisunuxo.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052fb7f1e4---gudigekojimeveradofobakeb.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a700404405c4fe091a438d47612e4376/woximapivafebotefadade.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160878c9ed1a6f---94893720789.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/ganifakinagamen.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/tilomuzelowowebafufovof.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/15844218361.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/jofebozatimesegonufo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/m091evqt99mcvlfrusc10ahf52/dixonovegimov.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aeaf3a3c48---20257338019.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/65519755799.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e4ee494db---nuxarawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=domain+and+range+word+problems+worksheet+pdfPDF 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_off0000cc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 11264 bytes
SHA-256: db7b3c886817c95ae482af61cc5a27c2ddfb6e60ce562c45f87e924ca80860cd
font_02_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 17080 bytes
SHA-256: 14ccb66ae627f7b2a96cb18a759e21e837275874121cdb9a138aa0a95ace2ef7

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