Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a61374af93efad…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 14:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b2e3d56b60b7f1d9dcd1aa7351cf32e SHA-1: 6befc8714086bc7a3d23dd3cd4868959919dae7e SHA-256: 05a61374af93efadf4cd92061903075cb8abdd0cfec81a8c7a06565a2bbd0f41
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://stark-tools.ru/images/uploaded/56502638986.pdf In PDF document text
    • http://ahdjcm.com/upload/files/9932579435.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/18677446216134c56a2db88.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161336d7064983---32575634135.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/34176727790.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/degowopexat.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb14217130---41444617505.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/84522774460.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/kasunidowezapupukanu.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/11664797111.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-4/20210904225743617242.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/11720932080.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/24561821109.pdfIn PDF document text
    • http://mobiliteit.nu/files/wawaxav.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325a671e819---12685953438.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/ruzezozovad.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/vojilixenilekolebuxeja.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/giwagomipexiza.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135b039589ed---45757565511.pdfIn PDF document text
    • http://ergakiland.ru/files/files/68729834332.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/19434618099.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/43153959303.pdfIn PDF document text
    • https://satesayap.com/contents/files/27331638488.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/kobazabudusigoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=paranoid+personality+disorder+treatment+self+helpPDF link annotation
    • 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_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 10880 bytes
SHA-256: b0e53add1e0d031653b9016397a76e70c03bff8cd330bf40f21a107fed5fd100
font_01_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 18096 bytes
SHA-256: 931077a0ad5bd8d06be516fc4aa8d490a0f4c37332b9a2dc1e44886876b38660
font_02_sfnt_off00011319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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