Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b97bec3d0b28ba…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 18:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3ae43792003c0eda6e8248d79f91271 SHA-1: 229fee33ab33ed6d24eeccf823bda8449062a406 SHA-256: c7b97bec3d0b28ba1244ac86d0b2f7251c14190b6c3a4f54e6109418fbb1d7d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d7b60a8eb9fe33ba05b4354c7430e03b/31624199335.pdf In PDF document text
    • https://butchercurnow.com/img/shop/contents/miduxeme.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/kibove.pdfIn PDF document text
    • https://ienter.bg/files/64294191048.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcba115ddc---kigadevexenoki.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/pumefunikuvebusunukekabim.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142044ddf31f---guwifudejovijuna.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/78540919818.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/54516977547.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614110a0f0f37---wimupajozitotasamowiwa.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/12128752444.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/84295534038.pdfIn PDF document text
    • http://rpelektromont.cz/admin/obrazky/file/78049899812.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/0ol8rahp2nmr3vhdq3cbgjio7m/sajovukezibesafewo.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/dikas.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/48599820012.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/winepi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497f9fd7825---kizibemogilowowupixosan.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/6099773728.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zogagorinufagopogunuxa.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/gekalefimorifud.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/40350976328.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/rugejijo.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/85812431287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=root+any+android+phone+with+pcPDF 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_off0000b1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F0 16160 bytes
SHA-256: 14843a2379ad561863c6b7a84a983c52cfd5024ec77a07e75f940ed62f729115
font_01_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 10644 bytes
SHA-256: 24661e99e7dd003e1fb75abc50c0f8a99ff2896f6bb8dec17355b60870dc87cb

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