Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d980501742b23f5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 22:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 633fbb659dcd9d37e9d1790a24d5247b SHA-1: 9137b3350ba1151b1c26e9fb2b5567feca07c4bc SHA-256: 9d980501742b23f5f6c378235ac95241c693d764cf9202bcecb32432159eef5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ketchas.ru/uplcv?utm_term=god+of+war+2+highly+compressed+for+ppsspp PDF link annotation
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/8ov5gs3cfeh31h7n541lrgfoql/gerulivezepobobuwi.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/latifezuturid.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/99976445726.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/silol.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/wojab.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/sarovudemupof.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/nutonopoze.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/77614785289.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/ditotulofiresojedavi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9a85be20---63376450174.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/50217375549.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/33422696046.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/rugefupuxoxeroluwemef.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161327863ee948---28776429231.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/xulaxekezepekorazutetu.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/dikanididutazadi.pdfIn PDF document text
    • https://togeltop.net/contents/files/73273869179.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/bigigodolekif.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f8993198---kosiziwa.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/potabufubepopetorisukemu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2aaa20e2b46efe63c31056e52befeb51/32653723180.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_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 18804 bytes
SHA-256: 1f3e6fae1f33a7cb123dde470bdc820f69c5c8978c3c50d94f26dd1155621d2e
font_01_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001207c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 11224 bytes
SHA-256: b892b03333b612d93a6ab866613f4baff02d748cc1310ff650505bd2ca81cec5