Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8d77d6e3c7c315…

MALICIOUS

PDF

89.8 KB Created: 2021-09-15 18:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5aa942fa51925ee94c6ad424da103716 SHA-1: 01e3c91e2a1e2e5ffbe95d805f17f4a800bfb1f3 SHA-256: 9f8d77d6e3c7c315be2a1bf6243741533ced4c8c2221a0a76a863776e7abdd0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4af822ef25e82c37c209229f6c352f7b/66478015273.pdf In PDF document text
    • https://digireg.cz/upload/roxexozo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9bbc9fcf---76669157215.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/87483116823.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/lepowekugiwenug.pdfIn PDF document text
    • https://spacio.hk/attachment/file/vijojenezugapodarux.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4a92c0eeb326fd591d11a7b33717b443/bufutuji.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9317e3da---kuzawasibuzid.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/35431281665.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/finedijuzosuvubogunifa.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/88073405723.pdfIn PDF document text
    • https://digireg.dk/upload/nojupaturovapen.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/posulekejerumo.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/95956620084.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/butowagavaronimibogavolu.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630872135B9SK.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210910021117.pdfIn PDF document text
    • https://tarsiman.ee/files/file/48831913099.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1792d0bafb5c5ca4d263e3b00128ef17/29406083620.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/gujafikafowixofetebutaju.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/zimitaw.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-12/210912233859094150guoa1h8mgt73.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/29390661263.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/40564014576.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/54590822205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=where+can+i+watch+all+in+the+familyPDF 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_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 10508 bytes
SHA-256: 0193cab97721b47a9fc53072762a777f7f6b60eefb1dc9d7797233a81ba03a10
font_01_sfnt_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD0 17596 bytes
SHA-256: e94103a028c63355a3291ff6bea858f5e5ef6462b9099e92a0c43c34bd26ecd2

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