Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada398bf90608bc2…

MALICIOUS

PDF

91.8 KB Created: 2021-07-05 21:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5025bb17c39dfb0935e41ec9a6ebd551 SHA-1: dd58f977a35a2b6ec9c80237f01aa2f58fa2dfd6 SHA-256: ada398bf90608bc255e9dd5f67297cc63676b85f1b29503f6d54a2b4d3358563
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=american+indian+wolf+dog PDF link annotation
    • https://babamore.com/upload/ckfinder_temp/files/20210621091120.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t1tvr0pu5alfv0nblsok0d34ll/zubirukujudulezomewes.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/xofibavukoxebigejipu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/4c7eea3bb02dc45a56a23a205ce77fbd/bisekijug.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9meidipnuel9p56d4ct0lqisel/xusetenivezapureposerufe.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/bidisuzolulaf.pdfIn PDF document text
    • http://asustainable.com/global/file/fowowavovijepunudo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5c082a3210d15d805c3dfe5611c9bad0/99250653132.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/kisixezixokixewasazev.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7dc169ba3---67625922956.pdfIn PDF document text
    • http://greenbrier101.com/userimages/vutomuvuvupovemenez.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a11be274e2---nupisopurijutanaju.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/molikowagaxanonoge.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160787307d4a13---6562717010.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/66279179957.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975ffff0c74---jebupekegenu.pdfIn PDF document text
    • https://avenue102.com/uploads/file/xuwafisevufovom.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d630288aebdda8374e05830bbd79665b/jokofudubudedobom.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/b5a883430860f3a47c096803c3083fe6/2991890490.pdfIn PDF document text
    • http://bronia.org/userfiles/file/diraxirosorexuxosagite.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd3cf88cb1---mutosiviwowowunowufegore.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/lufejupupu.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noteniga.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_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 10620 bytes
SHA-256: da3cbc203136f9040b5a16f2e86fdc5b002ffc8a7cc86cc31bfdb16d6fbc729e
font_02_sfnt_off000131bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BB 18608 bytes
SHA-256: 2af6245caf9ea7871c907fc61e4bf6ad2b462f5b0ec537a0a6a6f362c3127b6a