Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a755301e8335ead…

MALICIOUS

PDF

77.0 KB Created: 2021-08-05 15:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1e5280bad93370d341c1e679c756a7c SHA-1: b171656838b8cf696c201305bcbc2e479dd5dd07 SHA-256: 9a755301e8335ead8ec68fd0d517aa54116188d4221c74ce8f7680bd33072d99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics suggest the document is intended to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://irlanc.ru/uplcv?utm_term=life+cycle+of+a+tiger+shark+diagram PDF link annotation
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b78018f4e2---xinawuzimuwibanavepa.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/ripazikoguxunezuta.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/pisuzabupewadidaton.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25703970790.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cd864313d---nabuwabov.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2caf7777a8---gopobenumotexafas.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/pizaderagasogunelis.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/laleduwajexolu.pdfIn PDF document text
    • http://computerdoki.hu/user/file/47356571853.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/19850329343.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/88978306760e63068d49ed.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/afc100011c3e3b31d6435594ae6a8490/palotawanaxivapajavoduti.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160704898a201e---82764763354.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/ranixudune.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/tixalitinomejo.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210620122352.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/damikibovotipevizibamiv.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/14105037622.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ca483d5b494---19351693997.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e10210ee---94273881072.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b012a0a974c---44420694195.pdfIn PDF document text
    • https://norservis.info/files/files/walokijatoro.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/47d6b3dce9328be6b802f072a79c330b/45237089755.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/89205230204.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160965e9b988eb---zodixusok.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_off0000ca2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 16568 bytes
SHA-256: 387f68887aa10d8fc9d2bfe96c1350b949ff54ea2d6477e3a03654dd98972bf2
font_02_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 10980 bytes
SHA-256: 3d81de9f6150b4350ad0bd419ff54775df2502c1aea38aad6779e5d5854f2637

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