Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e0978ce09c08d4…

MALICIOUS

PDF

121.9 KB Created: 2021-06-27 08:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0ed74edaaf87c4fea85d43511b343dc1 SHA-1: 096569d0099ecfafb2aadedf4111a20a9fe1bc17 SHA-256: 40e0978ce09c08d41f8d7f5bca2c6d8f8d0a456411318740ed1116be5f1c7964
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a phishing or spam campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608097f1cc80a---jadatawu.pdf In PDF document text
    • http://exmar.it/foto_fck/file/mepifiremiwaf.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/libivugipolatobavixomexok.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/niluxalelifebuduwipo.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/ripuwakugabexag.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087a984328ed---89166519363.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/90501248709.pdfIn PDF document text
    • https://topupdana.com/contents//files/gokoxuxokofodabiwag.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/54269022607.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/rabotadusamuvebes.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8e465709---detimajezisobeful.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/patole.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc10ba332---92419594018.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/vekuroxunugulejuvez.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e62245e0e1---30891561714.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/sakozimejuretifa.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/dakexug.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b7ff3e8f285c0dc4a2af466447a8cb0d/najemenagiwu.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/69708413558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dragon+ball+broly+free+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159EC 19780 bytes
SHA-256: 4b8997902730493d419ce069e01f21be8a528b7f388966acd417e5a9d2bde6f3
font_01_sfnt_off00018ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE2 8756 bytes
SHA-256: cbcee38aff4e0b7071afcf7f2b22784017785ab4713813bd2c5cc5f894be7ff4
font_02_sfnt_off0001aa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001c29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C29D 10380 bytes
SHA-256: 852923b4e4062b22f6907e4473486d78002a616589e5b147cec1e792897e7c08

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