Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9461b7b7be165b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 23:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ceb0a60b7e76207f49648677e07c7c41 SHA-1: 7a6a30f7024207299b7d4e7c010381cfe8e5ebc9 SHA-256: fb9461b7b7be165b577ec911a1d6e80988ca7112f74880ff3c125dbc87c677e7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://studiofapas.it/userfiles/files/lotafigonijesaritape.pdf In PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/16013220013.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d879e4166fc---wulobexaj.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/kolipudiro.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/lufojawimikinuk.pdfIn PDF document text
    • https://masukpt2.com/contents/files/66703184293.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/boponezop.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c04012d9e---77841332125.pdfIn PDF document text
    • https://777mto.org/contents/files/fodatimamizixum.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/difanegekibakilulaw.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/17923878590.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4c861118e---84322320250.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16108a68daa32a---bisavaxedawufu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd3f38508---gexutamog.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/donisu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080520fa83d5---pexuxadiliwilufuse.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/43007221432.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/62738406878.pdfIn PDF document text
    • http://wami.cc/data/files/xewodivuvamedifadi.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/38259241692.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/fijove.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/sozami.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/xigozuzitelinadolor.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/modunamuzuwiditojewibisi.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/luxomazeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=methodologie+dissertation+francaise+pdfPDF 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_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 19180 bytes
SHA-256: 5279348816562c6f966e70321702664e7f68c9635402e7fdd575b246211951e4
font_01_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 10892 bytes
SHA-256: bf6cc0d87f0045c62c2badc324afab77cd29c050933e8fec676ffeee209d62e3
font_02_sfnt_off00012400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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