Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca6951ba1150d32…

MALICIOUS

PDF

89.7 KB Created: 2021-07-17 20:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ee91091209266ae6fa71507c3ff26fcb SHA-1: 25f355737debbe04878e2ddcf2b097b84a71f8a6 SHA-256: 7ca6951ba1150d3289150d54f17422d396ac3aa4211e7ca1b5e2b1e4cfc2aec1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which host further PDF documents. This pattern is commonly used for phishing campaigns or to distribute additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0c1f4ed79d2abafebac6d7faaa97bd61/zogutesok.pdf In PDF document text
    • https://numen-wow.com/userfiles/cloud//files/valoveg.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/65b2204f8fa1ee49f678449d9c701b08/zutadakuxeb.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d4688d35---bapewimubupuwuv.pdfIn PDF document text
    • http://veitali.com/upload/files/34215066811.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/safus.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/jogamabov.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ee3dbe8f---17422848638.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/74452c9a3b0aea422137bc6c6f6aa1fc/xadakeb.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/bevuperaxaz.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/rewowepokemulaja.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa3c496767---vepupunukipudata.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/9536fe164bc6869297c83368a9919f5d/zewupebevekeweni.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/85777458231.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb5f51fc3---xazuzawozogetikavefaja.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/gazajowesikenowufezubiwu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/pelilajorasakep.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c59b646e0---mefajoxadidivurosevibipu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160884f3fca7f0---vekutetonereronekatu.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/u48rf0abultbh5e7vi176d1ube/mebufibavetuju.pdfIn PDF document text
    • https://giustofiori.it/file/figavebifu.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210621234948069.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf1bc55a58---kodel.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/pozipevokusajag.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/xoditipidebi.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/77223073169.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b83593628380365c5d18d5d9e0fe6b45/xagutonorowomepim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tubidy+free+music+downloads+mobilePDF link annotation
    • 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_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 16988 bytes
SHA-256: 5489e9fb4f6cd6e58d407e8570e2a040c9ab8b83ee94e6e07b3b0ba7e3eed682
font_01_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E48 10940 bytes
SHA-256: f9bef6b39d1db023c37212fcff20acffa7fe666533673d8b7fae799b39efc2e0

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