Malicious PDF — malware analysis report

Static analysis result for SHA-256 c419240d8a0291e9…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 19:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 236b0a324d32008d2c07ee7caf2ea665 SHA-1: a5685e00ba65395f612d520d7602aadb2182775a SHA-256: c419240d8a0291e909bb33a6740d7d9c5f9242b01899cc7f03e5ed0be294520d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate the download of malware. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=dream+league+soccer+2020+hack+download+ios PDF link annotation
    • http://svatba-emi.com/uploads/pages/files/82706304883.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/66437829161.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/susarexidafawed.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/42914070680.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/66326483277.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/murivupexarukusosa.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146455a1bd69---xebupemunoxedelaxopawunit.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1d3dc23fba15d2748846b0de8fb7cb6f/78210561781.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/suwufixozi.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/83434070433.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/mavasolomodo.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/18467132575.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021092305590793.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/31240729164.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/27334271927.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/64895872049.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sugodiwenuf.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/rupasakekiv.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/nujirokem.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/nozuzijebetobupodod.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/kamuwukejajibizirojelimi.pdfIn PDF document text
    • http://budka39.ru/files/ledofufixarotelepajokiwi.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/85299123235.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614d318051d92---55559408660.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/92605511714.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_off0000b1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B1 11240 bytes
SHA-256: 4def1aa0fb6b1700eec888203bce79875d4bcec71d6bb33bfa519e1386c66883
font_01_sfnt_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 15196 bytes
SHA-256: 7a90db6ec1030287f95b5e369d02f36e5e5f932e70e45b00d524a03e0e08f2f9