Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1470f3efca1a99c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-23 15:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a82b11645160caff6cec025dd1813aa SHA-1: b9c9cb9db40a193c51b6801875c3e82369bcf63f SHA-256: a1470f3efca1a99c637ce6a288a0fcd12abd6258112188cf3625ce720342d35d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised content management systems. These URLs likely serve as lures to phishing sites or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=kill+the+plumber+android PDF link annotation
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/lijusajomelujuwep.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/xuxuguvutonexuzu.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/67937329272.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/12266148553.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/pawuj.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/24463415837.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/wulun.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/fo83hsalkdl39h70re632ik4o1/45654608091.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/6752091504.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/megufudegijumuxibo.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/tozitogesika.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16132535a03c3f---77945913636.pdfIn PDF document text
    • https://path.mn/userfiles/files/61905451890.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/21871490046.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161455c18cc663---riripopi.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b972c81a5a---85984292752.pdfIn PDF document text
    • https://harom.ro/files/file/rukatunevumotuluten.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/40795649393.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/58918302273.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/muliduzujuzufezasinowipet.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210923014326.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/zekubuxoxa.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_off0000c47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47E 10720 bytes
SHA-256: ab65c314e33f85880f9fd46949b0080fb50476b70f935f0d7b4f7994e6f15a02
font_01_sfnt_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 17476 bytes
SHA-256: b68feec055098ce6caa4404d08013b6934a55b956bab4c7521575b97853d76c9
font_02_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1