Malicious PDF — malware analysis report

Static analysis result for SHA-256 652542470fe1b173…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 20:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bab84d0b3e9ac31316baaba1e6d22e5 SHA-1: 6a4462ed3a370731cde165e0f566718dc103713b SHA-256: 652542470fe1b1731217046e3243e88b600ce7d3bfd04d81a1ef019dbce10026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=zurich+scanner+manual
    • https://wegofa.com/userfiles/file/69648350454.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2e5ec056a---34865408322.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608569d195dcc---11421673466.pdf
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/74911247117.pdf
    • https://airbays.com/userfiles/file/wikeje.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/85729615253.pdf
    • http://ggmtc.net/userfiles/files/51727103128.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/potezezunodogavolofu.pdf
    • https://bestcoloringpages.com/userfiles/file/dezifoxegovit.pdf
    • https://ijpdua.com/contents//files/jewenetudu.pdf
    • https://study4student.com/cache/fck_files/file/83139262425.pdf
    • https://watertorens.nl/userfiles/file/migel.pdf
    • http://eraucheta.ru/uploads/file/wonewujigavuvinekisaki.pdf
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/53737391079.pdf
    • http://premo.at/userfiles/file/54188272138.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc7b7da7a---40746288091.pdf
    • https://viadagio.be/userfiles/file/76247954999.pdf
    • https://almuhja.com/ckfinder/userfiles/files/fodelebemotilepitijozu.pdf
    • https://dcoderesearch.com/uploads/71423902502.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d8b875215cf1a0170e90c00c1033b7d0/miforuroruxixamel.pdf
    • http://wsmr.us/userfiles/file/33919248242.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766a7e8582a---zevekefuxuzifowifilu.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ff945287---55559729265.pdf
    • https://bestcaps99.com/ckfinder/userfiles/files/36839888445.pdf
    • http://volkshilfe-ktn.at/images/content/files/2386903520.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfcc.bin
b52286c843f8d6600bdc7a437d274b3553b6a9f94ae197c18b1578b6c8db0561
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCC 20992 bytes
font_01_sfnt_off00011789.bin
74040051f3d37765612da2b79f86ee64b2ca3f3019c9c170767dbb2bb0d6f9bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 10340 bytes
font_02_sfnt_off00012ea3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA3 16792 bytes