Malicious PDF — malware analysis report

Static analysis result for SHA-256 7765ecabc3ef3960…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 12:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 113450741aea6b8d5e0fa6663a2f5830 SHA-1: 9d80a1ae3166c4a8f90b7ee23d83a521ad3fa999 SHA-256: 7765ecabc3ef396079eb1dba1442567b93c75b503c564c6bbd6bc9c813f3903b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure indicate an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://archism.ru/uplcv?utm_term=most+popular+car+games+for+android PDF link annotation
    • https://lemarko.com/userfiles/file/xixomawuputuvusowomifa.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411828b07f3---16322684556.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/saxekimusefolejaf.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613407ba17a1b---rosaj.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/17922662416.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/tibofojiguxanilazafonuko.pdfIn PDF document text
    • http://flexa.cz/docs/file/kaviketobapevejuvemivaxaw.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/koluberogusavokax.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/watedotulax.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136755947e6a---kobizabowawifufes.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/16640482327.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/46842982332.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/dilarefugepafomodoposebek.pdfIn PDF document text
    • http://masonhn.com/d/files/kafokefuxodubotujuf.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/ketujiroviwedavusonabos.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/perununi.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/tojalekanolofaxut.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/dedigixufadamosokisibav.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/volezelepotoxu.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/63528290866.pdfIn PDF document text
    • https://akconta.com/uploads/files/wimabikemunedamopazo.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/15960421163.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/nogojezonobovutepizij.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/mefomuwatovozogiwusagi.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/pijebidejomagutar.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/29730498909.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/84077686409.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
stream_004_off00011ac1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11AC1 11056 bytes
SHA-256: 50b75073e671509a8118964249884d514e55577ce682e5779fc3d9393fbff693
font_00_sfnt_off0000d572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD572 17580 bytes
SHA-256: 24d48201cebd0a224f7e51445ebd3695edcfcaaa9bd83323eb4fbb99377a342f
font_01_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1