Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e10260deab299c2…

MALICIOUS

PDF

87.3 KB Created: 2021-07-01 23:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6c104a52632c7d741eb631f4e53e34b3 SHA-1: 6aad8e818d2c755a346e6be9b11cc3d74d3cc2aa SHA-256: 4e10260deab299c2e6f5c768a090d03bab6bfb8a14560871327529d268a546d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

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://queure.ru/uplcv?utm_term=briefly+in+english PDF link annotation
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608776424c3b9---98637720488.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/31850871447.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fda2644d3---10359574650.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/f0bcdk7pq38ndi4kcc3hq4vq75/55819756485.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/88089128860.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c898b2c5321---17110360045.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c990c825d67---37194040916.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1d128e9a9f0b0b12ecc16058fbf7dda2/vijupojiwapaku.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16086ade02b9e3---58664243525.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca06e7048---tunedavilavukarakogiku.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afa892191c---mejirojimawoxukidor.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/03fa766d4e7898e91e120eb37d9f65df/xegarebetodexiri.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/dinerino.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/nuvekeginaroj.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210615203449_b2fbof.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wudebomodubufipu.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/lizuvug.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 19860 bytes
SHA-256: 2e9f61eae0bbfc8db546fd4bfa589db03cbb3c15c7fa9d2bc66e3e3d41ba1fb3
font_01_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 10280 bytes
SHA-256: ec4d6f8348aeb94278610bd14083870c5d985176bdf90e679c740e1afd679773
font_02_sfnt_off0001173d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 19972 bytes
SHA-256: ba3042ce25158ad0b2848fc91a4d9cd662b6d7ec3c561f6ab0cadf1100a31ce0
font_03_sfnt_off0001381a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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