Malicious PDF — malware analysis report

Static analysis result for SHA-256 159846c8e98f622f…

MALICIOUS

PDF

88.6 KB Created: 2021-07-30 07:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb23784823427e0b92cf787cd96f4cfe SHA-1: 2696e69eac8cd91fc73c85b32c370a549913a2f4 SHA-256: 159846c8e98f622f39015c74b5de2b3b8dc4a263cc92fabc9f9c8fed136f7be7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and embedded links align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/uplcv?utm_term=how+do+you+remove+all+page+breaks+in+word PDF link annotation
    • https://murten-hotel.ch/userfiles/files/pexamidokazowibo.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/859bd710f38ff5fe8b39e6f70ea3c086/fujifodifunipakizif.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2eaad3fbc---54364833515.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/kebidaf.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/18hiu4chirvha3cla313daif6b/32617805140.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/79flaadujjoligtekb8c4d8ot0/sugetifokutolugid.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5c7dcc55fd4aca81928d6b681982fa13/jemewewebota.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4affdf6c0281f032d55cb6c22e21956b/62679662759.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607940648490a---vuxazufumowobijom.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/koruxojikufixafepimixufe.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/80218670448.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/basemizefinur.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fbsj779rj9ec1o167k63fkcd37/90895834432.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160959a7737997---23000300380.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210610123319.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/50539163021.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/mofuna.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896d9a5c7af---retezurodowusopipit.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb28c98b4---73488112102.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2b529a3ccf674957734c7c2ad0a6c0d5/jomenena.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_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 17132 bytes
SHA-256: 2e5e311de9f1c7fd89560b8e2dd8fb02942cae13f19cdea5b30d0ff1b96c9265
font_01_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FC 11224 bytes
SHA-256: cb4bf27f46986abb35250f68c2862c286285ba6229b0a900b9ca188e724b0bf0

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