Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37d0f11df2a7ba8…

MALICIOUS

PDF

96.1 KB Created: 2021-06-29 13:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a7877d63ab0ae083c321fb8fcfc3118d SHA-1: 47333f6b63bf94d5d6700aba7d75202aa192f85e SHA-256: b37d0f11df2a7ba8fddcbf2ad1edaa0f2a2bcf4681ee85ee373b1405d9477866
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=somatic+in+psychology PDF link annotation
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce3f70c11---21430847303.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607643f214fab---xovofinakofumutopoxuju.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/nubojotato.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/vejamenewunaguro.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/zepuninajubexa.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16079d6862266d---35244531822.pdfIn PDF document text
    • https://faprosid.com/file/91777740394.pdfIn PDF document text
    • https://noddy.nu/images/file/99820499502.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/98408db2321bdf4772c7fc2fa493a98c/fiteri.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a7465bad0---tiregedawemupusekitoma.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/71345950860.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/59797499661.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/6902027690cd3fe914bb5ce1f08b406d/1171194279.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b83b75132f8934770f4243475d36588e/86524171331.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/18398773394.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7e6c511db---4759267755.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/32c9214c182f7329b92567a3d4d3f37c/26131257891.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/tovesir.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/51025002568.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/zufalokuzo.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/45160200029.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096b74216397---76009137552.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60ad6f287---botog.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_off00011422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C39 10780 bytes
SHA-256: e59b4cbb621e57263375a880e799d0b8dd0ad6a346c7305ec272b9b78b051b08
font_02_sfnt_off000144d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D8 17276 bytes
SHA-256: 5dfcc56a122fd02470abccb4a4bd572756e9112f34eefc16f145cab8d8a7503e

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