Malicious PDF — malware analysis report

Static analysis result for SHA-256 5548135aa7f5a8f4…

MALICIOUS

PDF

82.9 KB Created: 2021-10-12 03:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cbebdb3e367c74f6b5c283089cbf13d2 SHA-1: 8dff78138e5898059f8d23c7dee391a2265926df SHA-256: 5548135aa7f5a8f443cdec0d965c5861221c6b4745af4d30a9a085e21b0884e7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links indicate an attempt to direct users to malicious or compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://angem.fr/userfiles/file/2371100643.pdf In PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210911_B3310FF3B970A270.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/gobijodobelevep.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/bajonusezulinikubanebode.pdfIn PDF document text
    • http://juentai.com/userfiles/files/29669883245.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nusdvc8hr6t195nep857qepok2/lamugofetipav.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/41135807498.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/1636045853.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/lanodapevisefow.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/83556520565.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/zosagujipibinulinorope.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e121b32eb---2492598134.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/gopakipajomixijakiw.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/migidapufax.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/30876647474.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/77872814337.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/7661263891.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c6a5e6cce7---36620278610.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/732342255.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/tudigu.pdfIn PDF document text
    • https://cncunse.com/d/files/jobabi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/22042fd6633c8a3f44da9bf4c4a48434/vavazixezujawukeb.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615f42560cacf---37248327185.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=meaning+of+decadent+foodPDF 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_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 19648 bytes
SHA-256: 73900a920ad839c0e34cfc91a9a480ff9c3ba115354760061d746ac15f023d4c
font_01_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 10328 bytes
SHA-256: 39f22963034a6470469f137e4e61bca699e7923dfec2a7e92c2b5dd8806d48cc

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