Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aae6e3187b1ed4b…

MALICIOUS

PDF

94.0 KB Created: 2021-07-31 16:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b4e44160c0147a7951f17c1f2d9f91ac SHA-1: 17f73810847b94363cc82265dcc52d386d249c39 SHA-256: 1aae6e3187b1ed4b133b914ea7bd4d2abf9b0dba60c8c11fe46f9c17cc950617
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the document's purpose is to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=vocabulario+en+ingles+con+pronunciacion+y+traduccion+pdf PDF link annotation
    • https://cvsc.co/userfiles/file/jutadanedumefutipotuzaf.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e6b025ae8---xutadulunuzegufitivagu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/vezonurozodalovoz.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1559093d7927e67c2af3545eb35f825b/maralopafuxabofuxor.pdfIn PDF document text
    • https://ivanamihic.com//files/32825389024.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/xepafikobufodoko.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9fc0ba98d---90845026733.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/77447462676.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/gosubofezigakufe.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106221204582549.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c686700d9fa---fefilasasotezenexunano.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/13339526063.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/3348435835.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b4b0fecc761ce9ba38e693c53e1c292a/tukodasibuvil.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/jemiwunuvewezofig.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608563a16f394---zawowajopuwopinegija.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4eccabf9e---51244792861.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/bisevadozep.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2a39c1dec08aeae9ff813e48077723d6/fikagobapazufu.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/4313459100.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021073012325673499.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc0b508c9---50515796056.pdfIn PDF document text
    • https://agatanorek.com/files/file/pimujemomew.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/widop.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/53206922260.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/bnq1ruqrbtdfmmh05up4lo0i51/61705144390.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_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 18420 bytes
SHA-256: ced866954554fac0a02425c0f6f6abe5d9909dab4558281055235800710d03f9
font_02_sfnt_off00014da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA1 11120 bytes
SHA-256: a8eef833d6d4e6ceffbd4544012178290a6b2db74505309a012d5e7d625bc229

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