Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed71257abff4cb9c…

MALICIOUS

PDF

89.9 KB Created: 2021-09-07 18:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e2aaf22866467f3f0ea4445139ca819 SHA-1: ffa5f7b60607c0eeb9e37e50bd0c67ab8da020c7 SHA-256: ed71257abff4cb9c3c62e2cec56cb7a7e0d62456181553a84dff2c8d0adb32f1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary attack pattern involves luring users to click these links, which could lead to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=mishkat+sharif+english+translation+pdf PDF link annotation
    • http://holzbau-napetschnig.at/17851381452.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/fedilitiwagajesasabiladub.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/gavinugevinetuwu.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa47751dc86---zagonadelido.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/dffdea2dac5386a2a17edf9c488abe07/11698771206.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b025bef9d---50431865599.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/477d3a83ffca417c0c7e3f0e677eab33/satixozatetowesap.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fbb5b39ff35c9fb72f2952d9441fbeab/59600060649.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/aeba9875fcc41bacfed71d8cc7639f86/90383661857.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/3266810852.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/bimawukiboloxi.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/87591342464.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/39m30cc67c68u0frrcc4qq76b0/mefipuminuzabemapulujevet.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65680779e9---banabesozizimidegebabe.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/efb88af35b8d833d1a001f4d9869ddde/davufawovi.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/18968877755.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/vututusigogexupuxojolu.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/lapijaxosixipoka.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/95839631711.pdfIn PDF document text
    • https://ubranni.com/uploader/files/50258947766.pdfIn PDF document text
    • http://beiks.info/public/file/viwisufepuder.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/kizenusisimelavor.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_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 19200 bytes
SHA-256: 97a3441d0049ba89ed0d3c646909532731d42d9e6351a00d23d2451f55c441ec
font_01_sfnt_off00012964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 10864 bytes
SHA-256: a7c7294c803b10809c5ade72cf6c1bfa6ea49e84142ba4148ddb8b0d50a1b0ef
font_02_sfnt_off0001423b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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