Malicious PDF — malware analysis report

Static analysis result for SHA-256 525a36eea3559221…

MALICIOUS

PDF

75.7 KB Created: 2021-06-06 03:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 17b08577eafbcdfc4e12f945c519dd0a SHA-1: 8ae2f12b281b8d61e8228fbbe87ffb2ed10d93dc SHA-256: 525a36eea3559221102a84ee9466f397de83d981f997901410f0c33780f36116
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it's designed to lure users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of link farms and compromised CMS uploads strongly indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=touhoumon+another+world+last+tag PDF link annotation
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0b7e0774fbc0c8877686566e55441e64/xewem.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f472bd04c---95100499094.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/duvun.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210529085234.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f5d6216c---surusobetidodekuduteze.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/sb0f13ko9mvkt8jhuuhc166lc3/7376130627.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/nakotafeturawewo.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/25925992296.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6376d597c---sepopatigofutefavesulaxin.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160721bbe77954---94715511429.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/4fklo651u4gjpn42tu5vboiou0/purebiwowifej.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607033fa67e97---terejajosukujuzegoda.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/lozagawututufekufiz.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/20367215968.pdfIn PDF document text
    • https://afayl.com/userfiles/file/juvepuvikukowesokan.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/77e76pfsjue3894o3o477uia63/pavufogulemajukedofigina.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/robakixibik.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb82ab12c5---27378624462.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 5280 bytes
SHA-256: ad7ba396b6f0defff27154fd8e916eda62569f1dc38ed1edb8a5a35fabb19277
font_01_sfnt_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 10616 bytes
SHA-256: 3891efd0dd96c3013047f27d39cc9434a8f26dead0641f8e7b09a821fb4c21e7
font_02_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 16060 bytes
SHA-256: d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc

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