Malicious PDF — malware analysis report

Static analysis result for SHA-256 649f6d779c1ba7f0…

MALICIOUS

PDF

68.5 KB Created: 2021-09-05 08:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 800e352ce98736abbf435d7bfe15b64b SHA-1: 2cbdb8791de0725aba3877f5ecb055ae90775816 SHA-256: 649f6d779c1ba7f02b7ede2dcd3b33d2338d87d09416739e94b3fb4b2e2a94d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to various domains, many of which appear to be compromised or disposable hosting. The presence of these links suggests an attempt to redirect the user to malicious content or download further payloads. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/uplcv?utm_term=types+of+enzyme+specificity+pdf PDF link annotation
    • http://3dtechgroup.com/uploads/image/files/juwobinexul.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/111127959.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/3654850023.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/56741987324.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/42011849583.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/wivipexefude.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c97bd552c97---30269335177.pdfIn PDF document text
    • http://mp-journal.com/media/file/59568611429.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b7b9dd30---10589384342.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f28d652ec05---90033065175.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/xuxipinagatebupepanagovem.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f3d4bd44cc10c6e128ec23da4d26921c/vudifonalafuro.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/teujo1i48i3rmcsko5q188u1t2/36649438800.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67c08ae5f---98928957297.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c9dd7576---kupirikisesir.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/27640784397.pdfIn PDF document text
    • http://nfc.soo.jp/file/64023594946.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210621_9746290704372476.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/13006527825.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/45942758280.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2fb08d108ef126734cb481e71a9756e5/1097631469.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/rnlde7sum9sjmfjdio1p93tonu/98217360849.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c43a7568---tosomanafeteb.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_off0000b051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 10612 bytes
SHA-256: a07485099be9877539d28314f547b2995bc95f26cad8ee6c1b5fe5765e32a56a
font_02_sfnt_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 14488 bytes
SHA-256: b6d0b495972fd84ccdca19b2e8496719b47d4be2dcfb59fe987a96243396eb38

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