Malicious PDF — malware analysis report

Static analysis result for SHA-256 022afb32299bd528…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 20:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98e906d4fe6df5d577c9eda7bee384ab SHA-1: b4d2bec3c02514713e2949dc8e666714455dfbda SHA-256: 022afb32299bd52808a4baad60bf7553f37dfbbfb23b2aa12aa90494248c32c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=silver+tip+ranch+pdf PDF link annotation
    • https://bruceautoservice.com/files/file/32933662474.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/sejudowajemekoxujabi.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/93820352790.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202193_41216_785.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/81257246661343700a079d.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/51865517443.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/1511679120.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/89349472233.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/sdvsulrupvrqj5udq3rrvrg6lc/98302537159.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/gulokosomugivevebejexuvog.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/ziluzikutorogifomum.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/sajagederese.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/kedifor.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/bubosotusulawir.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/ziragoxizabupepugoxa.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/gagezejipefamugitag.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/88399566265.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/vasisijuzofepikame.pdfIn PDF document text
    • http://pnalog.ru/images/file/segitibateno.pdfIn PDF document text
    • http://vuason.vn/upload/files/31665963116.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109050420582787.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/xiziteperelonetozub.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161361214385eb---98772502157.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fea19b964158175f27b9d91a7903bf83/88200736063.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210904225612.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_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 10572 bytes
SHA-256: 25888149878942479d7bfb17e0a8c45b0f34ece1ce3b233739cdd378f77230f0
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 18132 bytes
SHA-256: c0a9fcd8ddcd1fe028671acc531cf61b8c155ae82e673d6eda6394aa24c36908

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