Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacafc68f5d69774…

MALICIOUS

PDF

103.4 KB Created: 2021-09-18 06:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f06405530933b57761b22cdc251cc11 SHA-1: 2977a67996db3ee22bb2b5340a518b9f83f6866e SHA-256: aacafc68f5d697743602b02a8006fa71568a1141c0fc92e8bc35cdc035ed8702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=how+to+screenshot+someone%27s+snapchat+without+them+knowing PDF link annotation
    • http://spec-so.ru/sites/default/files/file/2332827831.pdfIn PDF document text
    • https://deepex.hu/hirek/files/wejevokopixugasajikawu.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/43795277810.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109061716312632.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1dacda96d---rowolatuguxovufesuxe.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/11211510210.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/40456609289.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/kusimopakabo.pdfIn PDF document text
    • http://bienbao.org/uploads/files/fazusanupuximala.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/45214564700.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/xatitojenez.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161353aeca76e9---84672701438.pdfIn PDF document text
    • https://medius.sk/userfiles/file/karomugodejizebu.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/24470223743.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362a1e414c1---fowifedagi.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210906_828364FAB89EDB4B.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/55919153458.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/51036375197.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/woxoturavapowalatupaj.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/xanenolofisupezipaso.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d054630a---femebim.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/jerikolane.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631562008.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f302326a8f---83319254657.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd53cbd147---96904017462.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_off000128fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 11080 bytes
SHA-256: c5308b907f6096ac98cd72685880d063e4ec368f60547ad40b0fa8ac4a4ac871
font_01_sfnt_off000142b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B1 19624 bytes
SHA-256: 3ed1554db5dcbf861840723162dd8402b964a2d03f2c84b04c63a6ce7172a116
font_02_sfnt_off000176cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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