Malicious PDF — malware analysis report

Static analysis result for SHA-256 07cdc3a1811f43a4…

MALICIOUS

PDF

98.6 KB Created: 2021-08-12 05:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 84357b4d969ee9d5edd547ad1ba11018 SHA-1: 679c2f6b74bffad81c109de64edeea93f8340eee SHA-256: 07cdc3a1811f43a491fb2a8869284b4e1970544cc9952e7307b6c69c33839c52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The document contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://catamma.ru/uplcv?utm_term=differential+and+integral+calculus+by+feliciano+and+uy+solutions+pdf PDF link annotation
    • http://vinhomeshaiphong.net/app/webroot/img/files/potuvemikidonikogage.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/43999970579.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/70859660088.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/sukoporizugusalomutona.pdfIn PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/maseju.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ef354a5cf750675f8156da9dc773856a/kitajikuvojumifuvesoko.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23503018448.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/bupiguzoxa.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3d5f8410ed87d8cb2911a78c903f6b46/98116196608.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/41905075272.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/37326d47677dbc9751b63ecb35adc5d3/kisuzogimexebokufakegot.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/1369899356.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/94551478173.pdfIn PDF document text
    • http://gekon.net/userfiles/file/12029301733.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/154e1dbae01933f8037291b1c330b796/67249060675.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/428d886f82d6a88cb7d04c85aefad091/kokajafadopudalin.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/32236381144.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/nemovumajo.pdfIn PDF document text
    • https://davaocarrental.com/images/file/nudixobiviz.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/ruxadimotepiju.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/jobiwefof.pdfIn PDF document text
    • http://bmcsteel.com/uploads/baiviet/files/kifiluxatunefo.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bumexisiz.pdfIn PDF document text
    • http://benly-carson.com/product/files/xutuwexibutolelavakax.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_off0001167a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E91 11152 bytes
SHA-256: 44bf35768e3ace4c20f7c4c8bbfa27ccc13d745d00df9a6b622102116495842c
font_02_sfnt_off0001485b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485B 19008 bytes
SHA-256: d2da07d66511ebf1f1509ebc267c85b32a242cf8a678dfc938a926aed9f5b932

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