Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a4e0c7908e313c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 21:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c6de7bb9b9f1d5f051747c4547a65f6 SHA-1: 541a879dfc4e68189a455bc6a530d2ca6c6e2f00 SHA-256: 28a4e0c7908e313c28cd66f644c77508fb0b7d338367ee3bc9aa47b2e70db9cf
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=fast+metabolism+diet+plan+pdf PDF link annotation
    • http://hoangduy.vn/vn/files/25158594144.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/kepefopepigodeku.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/25461030166.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160904a7420c0f---98465988075.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/g74de5ts0q9tq4amt7g5j4flda/59397073439.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/10538873843.pdfIn PDF document text
    • http://rrarental.org/upload/file/81147531819.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/61586424204.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/sunakanotexad.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/ralaruvigowutu.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/t7uci7e178md7n0kn4h7ooao90/desopuxumepakimogoba.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254700154f0---56723796270.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8143ee604389b06db8200a0f68724594/vufewopozod.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a03c6ab11bc---98073735796.pdfIn PDF document text
    • https://nada70.org/userfiles/file/94645524287.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/66695442446.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16099336fc3052---xoteluvoposovidumo.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/81404175486.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-10/20210710191155918486.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608112ddf4074---wokepimugiwadi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b453009fd9f---27920013136.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/d824qfqog09abjbrrgqaqne5ca/54387878711.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9ad047bd2feb4bbb39a47138836d34c1/32535300237.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/38fdb2f5ae42fbe8f1a7acef4a2a9f63/68663759063.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_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 17460 bytes
SHA-256: 8c92003ae4f199af122f73392cb6232e2c28da2329ffbe568a1cf4c95fc2fb59
font_02_sfnt_off00011ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFE 10676 bytes
SHA-256: 00e90b359dfedf51fdccd49942a5535af8c600f6cdd83f5a90ecfa256ff79758

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