Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff82817f6e2af888…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 13:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0bd7feec6857949545849fa7baf0061 SHA-1: e58bdb110e0797a8b0b848a376d107daf07dcde8 SHA-256: ff82817f6e2af8881f2198f06b762349cc18ce0be349bd3ef762a846550ea06d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external links, including those hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating the document is designed to trick users into downloading a payload. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=poweramp+unlocker+apk+2020 PDF link annotation
    • http://madmojo.com/fckupload/file/18378941632.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/wiruzovoditupo.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/newegamixukizu.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090114525359046.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/35879111791.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/mosumizuzokinulinuxopilev.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/9845046059.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/67822272411.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/wafediz.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/lovoguvolupe.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/50657239978.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/73504111680.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/41878562409.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/sodejalalubanagozixogo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/3ckqfu0ktg9uets9369k5l9jhu/mepopi.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/4671195509.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8162f66a---124117951.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/29298735402.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/98377527131.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/53779142265.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bea9a28de999de1fc5e20856799b6018/puwetuf.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2c83ae119---xuzal.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142b0157d1a1---tikusegufilozasedilabevib.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/82784928637.pdfIn PDF document text
    • http://budropol.de/Upload/file/liwozi.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_off0000beb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 16236 bytes
SHA-256: 0bb7ff3857a680a42d5404ab6a41ec5f793191a3a1f4dd28207fefee34786450
font_02_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 10696 bytes
SHA-256: 51d1506ed36c7ea2172b6b40d92324dff3f4a645a5f11de643a7341d553c9157

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