Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d6a804019804a7…

MALICIOUS

PDF

117.7 KB Created: 2021-07-30 06:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 972b567716b166837f167b418a626327 SHA-1: d18831c156a463e18daac15a38fb93ab129b0257 SHA-256: c0d6a804019804a78f4d2913fd811a1fd6c9a9910a33a01de976b1eaba4e27b4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or unknown domains, likely to host further malicious content or phishing pages. The presence of external URIs and link farm structures strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5b64f559e6ae0fa0c8a71068abda63d0/zojujisijupetaparajab.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/v0eiof0rs2mp822kgrsov0p6f0/gapin.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/e07b0e468ea34ef3c1e62ff16cad4e5d/95120016377.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/7726990132.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0af3c02df---85357333226.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0alulfs3133bca19a4rcenotp3/xuvagubodolebasewuj.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/vuteripokenide.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/tugawawudejajowepigonow.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/69560165113.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/24j5egief8taingoi7mapbhee7/28089101417.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078890d1e5e1---91328859485.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/dosusanup.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e909b636a---tidowagomele.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bb56119060f0ba570ae5b2c119464cac/30521414357.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/19941364831.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084b6d7db573---pogobebujumeroxegopexakap.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/zonusaziligirubuvigaseji.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bddab045dd---navozipotowapufigari.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078dedd037aa---fobezafosila.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc03e8f33a4---mipepewivet.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1a6cd9f5---doferu.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/runomovexil.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/p6p2t0i1b26jps5j8rb04ngsrq/39355846770.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/377f8c4d619b733218bbb5e347e85c64/zofolujososisadujisaz.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/vejazobobuwobulaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cyrano+de+bergerac+script+pdfPDF 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_off000167ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167AD 11036 bytes
SHA-256: c56c8877a80887787031a4f81bdad3273d0c498f6e6da44d62c2a334872045e6
font_01_sfnt_off0001811d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1811D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001992f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1992F 18896 bytes
SHA-256: bc7653fbf0270bef14347dec23945c923a0d9649e8de585beb4bf7c0042e8c71

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