Malicious PDF — malware analysis report

Static analysis result for SHA-256 576dd7fd4287b389…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 12:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d806a05bd8e4c51c23daacf1d2f95b7 SHA-1: 4a607a0dda06e3160b101baa196e2538a45ad49f SHA-256: 576dd7fd4287b389cbad2b6c619fe4563afea6a95a66cd87a1882bcf5e8ca171
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, likely to host or redirect to malicious payloads. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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://mbzgogo.xyz/web/img/podborky/files/86549206121.pdf In PDF document text
    • http://imssp.by/data/images/fxeditor/file/69829459365.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/78355358161.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/fipugogejezitege.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202108231505362176.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/xerakurovoko.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/wojaw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16090dc09c32a5---lafotufakunazojorokiwad.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/62585193098.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e2ee962f7d22facb33174eca59e7c0d3/bonebezonitufikasoze.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/sinagozonavotov.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/3497421515.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xakafitabigikife.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/zezovefebos.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/67403451691.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/78923153123.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/pefobip.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56ad4c961a---dobinagodomava.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/wisedobelanopu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca7139c56---wesejo.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/lobepekiwupazakora.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/87193317366.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/lowabusuzuxoxogopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cottage+life+bunkie.pdfPDF link annotation
    • 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_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 10836 bytes
SHA-256: debccc3a4ef55fb80df31a50830216e7c521a10a2bf6f3f13269e5326c91f487
font_01_sfnt_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 17412 bytes
SHA-256: 950464a1c0494608c7cb1326cfab597746d7f0de1bdb5d908358a58440d64b17
font_02_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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