Malicious PDF — malware analysis report

Static analysis result for SHA-256 e235a4bc525fab00…

MALICIOUS

PDF

92.4 KB Created: 2021-06-29 06:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d6578fd2faaeb32beaa04b9960de13b6 SHA-1: 4c56a9a7fa4e19613ff115b436a5817f6c463751 SHA-256: e235a4bc525fab003bfa524d4eacf53db53f4f5909cafffc1127dd46fa4ca5ad
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. The file contains numerous external URIs and link farm patterns pointing to compromised WordPress sites, suggesting it is designed to redirect users to malicious content. No scripts were extracted, but the presence of these links indicates an intent to lure users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=suhasini+guest+house PDF link annotation
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/41b430d8ab7035c0196d252f57868085/92636918310.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cdac2fd0cd6---98061965087.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160907c1d7722c---95631320636.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7fd4ab86799d8aca8076549db9f28313/jazujijisakejitijosofotep.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/93636872866.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/86516655308.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd2c8aefd---pufomabumobaxojax.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/86495373038.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/6svsnkjp7rh2stl38uvedhdhk1/11045950315.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/gogurim.pdfIn PDF document text
    • http://islandpointfl.com/userimages/26189338662.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c746d72995---wagaposo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081c234c999a---getomise.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/61215788878.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5da5ca8443aef2d02505cb6b6f15174b/morabamexo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9ec5232b1---satepamuworulasasenab.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3kbo2n3n6pof6967f1gllg83l2/85429135738.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3640960a3---3577266698.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/segijuga.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/h1g3vvpk6fddh57v96cmun9pd1/zafom.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/zikizumubuwusod.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/0aa12120e3d0c7c6b6a6dd825f4aea7b/59737449965.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bcad094cc84---29944921651.pdfIn PDF document text
    • https://papiratisk.cz/soubory/viguvevenusi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce90b0b3fa---najozalukufi.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d7c075ed12dd93ab3a34fd7f313051af/luvajodikebeluki.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_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 17296 bytes
SHA-256: 10b77e6bc0c61e086f186bf249f535121cf855bf00f3816aaf4ad5c082562a70
font_02_sfnt_off00014cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB8 10416 bytes
SHA-256: 28fb5a8b23bf798aae2af398cc40ddcf39892f1075ca1b34dc2b0135bf3383d8

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