Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b8ba6f57327903…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 08:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4f76e3c57a154f216952d4b217876ea SHA-1: 6dc43f09e27533bbf4c67a90eff4de718dae75a1 SHA-256: a3b8ba6f573279035d9eb49bde794d4f0a7c3acb515e2c67711672a17cd985ad
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting, likely intended to lure users to malicious sites. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=bible+definition+of+character PDF link annotation
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a041f2def315b34fc9bdeefb8eb43e58/ravuxisorem.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/59603202274.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e8bc4c8f3---5216410227.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/tuzukifovuvobaduzote.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/73874014cc4910f39e329da8b8f6f4f0/fixupij.pdfIn PDF document text
    • https://virker-ikke.dk/files/gegavivuloxudoliluj.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/64870905972.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/18671219721.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16104801f111cc---fevurapuwulabono.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f2bbddeb---85403113513.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef87ac4280---50812108136.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf207c159e---93311150449.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/vupaxevimob.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/84728856534.pdfIn PDF document text
    • http://soles2walk.cz/data/file/guvasezefixujesaxofiz.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0000ee75---64346548614.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38529215951.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/tesibek.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/eb725f370c1a187f3114569aa6676c60/45932119772.pdfIn PDF document text
    • http://autovoda.ru/upload/files/25080739720.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/lifedanekaniwive.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7ad8a31d3b1e18c1be917bed93562311/xuvogonivewujoka.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/zigato.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/jefozibajutexidalumonugeg.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7c71037c1---baxokovelaremananowiwub.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_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 16876 bytes
SHA-256: baded06233202306fbddc031f6f833b878e8e74c3ff7e23fe2da2987a825e652
font_01_sfnt_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 10600 bytes
SHA-256: 5ba2c605d29bbb9dce9af43d6fd45a2ba6e6eec283175291ebb81459f77dd8e2
font_02_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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