Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e0c5e1b72d97e26…

MALICIOUS

PDF

86.9 KB Created: 2021-08-25 08:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85a0cd830cea1368604f29af2b9e9560 SHA-1: 60111978f16e06cd3f036e7ce088a390697b3a6c SHA-256: 9e0c5e1b72d97e2621f815bfc2c14950fe2d3333c3baab3daa67f10bb9f8d44f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. Several of these links point to compromised CMS upload directories, suggesting a tactic to host malicious content or phishing pages. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://pistant.ru/uplcv?utm_term=beginners+guide+to+davinci+resolve+16 PDF link annotation
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e120aa2be97---fefapetusi.pdfIn PDF document text
    • https://triosms.com/userfiles/file/22380043539.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/jipofubi.pdfIn PDF document text
    • http://airfa.it/userfiles/file/xuparon.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/2420684261.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/19025021817.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/gejamew.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b960f528079309a2f54423c5baf346c8/65517024647.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/lofanudofuzuxof.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b5806d2b255bf8e991972caf66f451b9/50938931556.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210626202139_94yjlj.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/737a0055c10c235237968ad9a1847a17/56736759513.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/78103084376.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/99724709035.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/sekavopoz.pdfIn PDF document text
    • http://93564497.com/userfiles/3270178622.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb1d3aae07---wuwosixibofakopusit.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/74716476632.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/57f27d5d1d6119fcb5f9e664c0006e8f/mitimojetimidulixa.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/97075605590.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/35080085968.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5dea35e5d80c2b3da347e46d0f262061/kunubozijabubozomaberor.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e619c53a9b---konuvorogoja.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/22647359927.pdfIn PDF document text
    • https://tonitomov.com/picture/file/sogowoj.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/cccd2b62c33412acbfdb50ba74e9512a/99669620775.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_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 16888 bytes
SHA-256: 39da208b07db66da81ecb400c5c1ae3f8170dbcedc561c224be1909e3be8f654
font_01_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13109 10984 bytes
SHA-256: 9a76a6d96feb6a7481d651da03331e8c1e949be07e4aa67e2c5d535e43313360

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