Malicious PDF — malware analysis report

Static analysis result for SHA-256 384eaf5eccd39b43…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 01:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 80cfce493c1069b7459112e496045eb8 SHA-1: 90d2725158b9e66c1ea1df3af52a2d6b9c10f5a2 SHA-256: 384eaf5eccd39b43c6eb259df498a861f995c99a345bbcb848459db1017c9dd5
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this attack pattern.

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://crysiq.ru/uplcv?utm_term=pdf+reader+apk+for+android+tv PDF link annotation
    • http://sp3siemianowice.pl/userFiles/files/92411239947.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210914051111.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/murarozejakiwo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6be3891813b52b181f4ebac70c5774f2/dakapaxigewokutotosuvaf.pdfIn PDF document text
    • https://digireg.si/upload/zizinutesedotudab.pdfIn PDF document text
    • http://princeverma.in/uploads/files/83771078635.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/15552310845.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/95545237787.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370f04ebe34---67915548302.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/berazumovogufub.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/bokuzifiboxarironel.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/22434052537.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/96224652993.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/59825252657.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/warinebeseperuve.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/21801383511.pdfIn PDF document text
    • http://vladekoservis.ru/files/mazekaxururesewovajeledif.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/wonaximeduv.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7a535e36913b6b17877700a61dff359c/30349787434.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/26735105532.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/32603500273.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/be924aec7cb44cb81a406032f5298a5e/7895094893.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/wimudomojasekadibamarabov.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/41098215989.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/14169037368.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_off0000db67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 18508 bytes
SHA-256: 7c970f3739132aa9fbc1a2769eb73a4db0fcf56325bacacbb3465556f92ec1d7
font_01_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 10436 bytes
SHA-256: 3056646a5796dab1b05cfb071e55b3ffb3653a2f60e94b94583b721e7d30c109

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