Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e239e6dfa549cb2…

MALICIOUS

PDF

108.3 KB Created: 2021-07-15 20:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8438024967a244349a3ce4c9f5b8ed06 SHA-1: 8fe3bdae81e651f4507e167eaaebdf77134f6c42 SHA-256: 5e239e6dfa549cb2adaff0935be59c5e73f6a08d37e20d6b6f7d71380be66068
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=pick+the+odd+one+out+questions+and+answers PDF link annotation
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/17586064479.pdfIn PDF document text
    • http://vo23.ru/upload/file/9222612395.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/21850907038.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/vixemarafipuvovozenowi.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a187aa039d7---wokovimasemotimimupufef.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/egca42vrg8okfvjk0ibfs19i60/pivevipusuni.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/gulodewerax.pdfIn PDF document text
    • https://seikai.jp/free_images/files/donumidizudabixobo.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021062118084073499.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f96ec68c1---logeponaribuzifizu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f531be6ab043d359aa9e3833748e83fa/78011219031.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/munupapixakenugebo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cffc19676---gigemapivedaxipapulujuvax.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/tejidojasidogiwafujoga.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084024cd1842---71111919237.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/98674742985.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/28db35od95vngjtfikeld9pf3o/xiloxagezulexil.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/84129632386.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/23953289278.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b600fceb4a0---81902554984.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/zelosopuketebol.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ebb29092---76254702817.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/vedutube.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1babd6dd9733e26b1afeb2b19eb152f4/mefif.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF9 18836 bytes
SHA-256: 829b13e4914c05f9a6e9fcaa165dd43c6ed33a8465b83331f22d1b012b5a5f77
font_01_sfnt_off00015c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C83 10848 bytes
SHA-256: 780eeea79f59f37459d68eaf778a257cf9b129abb3fabf81e8cacd876c4c2af0
font_02_sfnt_off0001756d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1756D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D7E 16172 bytes
SHA-256: 637a9dac0afc585f1f105c2de408df99420c2eea19216aca5c902ef31b2be0e3

Open this report in the interactive analyzer, or submit your own file for analysis.