Malicious PDF — malware analysis report

Static analysis result for SHA-256 5803598c2caf924c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 15:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40ae4e8c6fd326603b76eb1f7ad05210 SHA-1: 718e5b6b6d0ab3116a948a82491b13a2e2999354 SHA-256: 5803598c2caf924cda5d01a2db2bc9c8dc31e8942b616dfd178f1f400c35568c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the heuristic firings suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=certificado+de+origen+japon+pdf PDF link annotation
    • http://star-transform-moscow.ru/uimg/files/newulawukasafo.pdfIn PDF document text
    • http://tms-operation.com/upload/files/vukekusofumenifixovub.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe1ad4fb4---85859673866.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b38c8c3465a---76538817739.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/jisikowufezobake.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ef8f196ab---bojupivukuda.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebceb6fb52---nuvimaxinulupuvukifugole.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/28078247589.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/ridegewupomesamerutaro.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/dedupik.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f021651e9a8---39260934324.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/97005918147.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/3916269728.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/livunik.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/84502062869.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/71971037988.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/2434133015.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/32246355991.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/supuxodun.pdfIn PDF document text
    • http://jkohut.pl/file/muzejelatabewajofirus.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/37249106845.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f949f05e4d---59971112655.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/25866518530.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a311c515d0d---89975339923.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_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 18368 bytes
SHA-256: 43d5217b5880393d9301d632572ae69425447baba3ef397f29847991d42945dc
font_01_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 10744 bytes
SHA-256: 429bdfb1286256cd574defca756a9483bb2ff0e7b114dc79e739300866c5ada5
font_02_sfnt_off000121d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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