Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ba3e09d6e72a36…

MALICIOUS

PDF

80.4 KB Created: 2021-07-05 04:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b4c35d87a9f6acd0811395f09e5cb4ed SHA-1: c65572fd18e81b7b37829ecc034e9e883610617c SHA-256: a7ba3e09d6e72a3620bce614564984a4d2f7f714b3e50a188441275b0ce5f6fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains 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. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it acts as a lure to malicious content.

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 https://philabc.ru/uplcv?utm_term=san+onofre+campground PDF link annotation
    • http://brlairport.com/images/file/konupewogoxa.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a1b5b1d678e3e491cbb3314d5b209cc7/muruvibonitovewenupipeno.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/346b8c0aeb11fe1c947958a74e3dcb7d/23609508403.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/008630c610b2a0d3e5dca0664f8358d7/poneralegukip.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/wilaxog.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/jerotuvofujokujamoboguva.pdfIn PDF document text
    • https://afayl.com/userfiles/file/18252102938.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/pq3898trc1bqgq8nl5688p2pbt/vewodosalonijenebugudizav.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/kenew.pdfIn PDF document text
    • http://amandamaitland.com/images/file/makurizasogomomotibiriva.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/xenigiwotawekudigeda.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c827d7181d---rovirekoluvafuvowabamofof.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a032656b---turavuwitibugopovemon.pdfIn PDF document text
    • http://yongqingtech.com/d/files/wetovutul.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/fcfe63772c472d223f79de64084482b3/81156402668.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/43989803578.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/bd225c8f3f136873b9801569a95a3f28/91584053297.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/bumuwilubovikuloxagib.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7486590172---jixarisuw.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609684dc9f430---mizugajozabe.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021624181404401.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd74cf175de---mamabedox.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/87bc1f2e442c038f4349e649bbc80aa2/bugekurapidosutu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609797ca820f3---zowafizosimuweri.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_off0000d43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43C 17796 bytes
SHA-256: 1acd25fccd8198ff7d8f423244055085560f7667f6b88597bf05e4b364ccdfcc
font_01_sfnt_off00010281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 10732 bytes
SHA-256: cded1c5b677d12ff6ada44f497b8ba1932f8c15bf4d8ac35a80cb77fd646b01e
font_02_sfnt_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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