Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dbf7b389d340aa…

MALICIOUS

PDF

97.0 KB Created: 2021-07-04 20:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7327719e803c2c055c24f79817421dc9 SHA-1: 74abec2f5afc3744e070655ebdb367e03116e039 SHA-256: 99dbf7b389d340aaa53dee6a9ffbfabe93b217c77859dfa72512eca267fa4917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ketchas.ru/uplcv?utm_term=kwh+to+power
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8c775f62---56989933974.pdf
    • http://alpha-cp.com/userfiles/file/vakezufopefobuxugi.pdf
    • http://prodottoitalia.eu/userfiles/files/80768650447.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a3e11a4a75eb96a683b127388e704e77/rukewenetolegu.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8b8ede962---mivav.pdf
    • https://deltarents.com/upload/ckfinder/files/tixemufofegawofud.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a98aa6261a8---goxusufos.pdf
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/97802638155.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/74a6u8vg8kf4drueuf6tfu04sb/19343834275.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5a1fb2cb867041553d9d6748b56ba22d/lijapuvujidu.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/i5dsbve0m66aisg7dqrn7t7mid/tosiwidefomiduvemenos.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8qup5cd2804q8ptje80ntdeone/lonaxabepaserelobazikilig.pdf
    • http://dmkaudit.sk/101/upload/file/ximerev.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/49270931308.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cabff4ae43---69245262619.pdf
    • http://goldartline.ua/userfiles/file/duwuzemububelorugezovin.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/96556434401.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b4f6c8a6---6759847536.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/g73gic8r78racg07rmfl2mul5r/12393453755.pdf
    • http://scamps.biz/userfiles/file/61103012386.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011afa.bin
c2937e01993a69889f3d6216bccff3236c41ffb978b41b19edd61e2cfee0093d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 17916 bytes
font_01_sfnt_off000149c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149C1 16792 bytes
font_02_sfnt_off000161d7.bin
1ff6eff035ac2bbcfbcb8b7e63cd949dedb126bdd06b0d492e4c0e26b4f3102a
pdf-font-stream PDF embedded font (sfnt) at offset 0x161D7 9856 bytes