Malicious PDF — malware analysis report

Static analysis result for SHA-256 c737eaad53cbc6d9…

MALICIOUS

PDF

86.2 KB Created: 2021-10-11 02:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2b9f0ad927c7d3286ede4a82e65747e6 SHA-1: 81db32f34faab0994d42e24bf2d16a1af555885c SHA-256: c737eaad53cbc6d959b517adacdffc1a925ddade8d30e4a41908950961d75c4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=project+ascension+leveling+guide PDF link annotation
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16158c0daeceba---67729502955.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/9112894424.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/49080690202.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/d02d61e68b92b9873a7f7b4d8a10f342/59310331496.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/40561384833.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/sukodogaxogevajoluzamodav.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/babopaxupofepojesejujed.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/jenomaluwesebogo.pdfIn PDF document text
    • http://autovoda.ru/upload/files/6735946763.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4503e8c380bfab56dd0ff99adaca79ae/15252101573.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202110071510348519.pdfIn PDF document text
    • http://chieucoingason.vn/files/gigobotafakuwonadevero.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/sagoz.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/9302088516.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/fupazugizizufidekirijoke.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/wududaxolanovepigeb.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1615a25f952fe6---53348714229.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/34291122227.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/597379053f39c5a2815669d3f953d4c7/85962021803.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/zimiworukebalabow.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/65703415104.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/7732631663.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/vilubijixop.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/74530474661.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_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 18724 bytes
SHA-256: 454749c9de7c15d8350c4559d7e7d7d48140d4b5b2eb647f069845aa1fadd243
font_01_sfnt_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 10844 bytes
SHA-256: cf031139d575c23e455789a718f57e5376a589c6c765c7365427ac5c4869d175
font_02_sfnt_off000132e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1