Malicious PDF — malware analysis report

Static analysis result for SHA-256 531dfbe6d509dcea…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 01:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 799f8f6ee8885446a8633e2943c1aca9 SHA-1: 198a638302a247d06505ca7de218359ce940b934 SHA-256: 531dfbe6d509dcea271d2a83525219c3ca4a073d06988bfe2c3361886700fd20
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=fitbit+charge+sync+with+android PDF link annotation
    • http://mebel-moscow.com/content/xuploadimages/file/tixijusagemesuvel.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/28173997287.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/netubumalokubigigopab.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/56202564130.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/seuq8f38sem7oh79cg071got36/33866687.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445b75183b3---64732239312.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/80276955553.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/43406839007.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613231a4a236e---95552530954.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/53188212570.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/zinexotoliguxogu.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/55462094637.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc4606772---12511773393.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/lopufikifoba.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/zatuzarek.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/jeresejaberexevatodedi.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/veregisir.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/75590732677.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/81667641401.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tojoxokubagitofokigivofin.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/29482050302.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/vesopifuromadol.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/tajejebulolibozesuvuvim.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/totivutewititobemoz.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_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 10920 bytes
SHA-256: 16aa3b12585339823cdcddffde56b744ee5c90682b7852c51961aa375a44cc0b
font_02_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 17732 bytes
SHA-256: aeea81ae5bed290b73ba332c8bdeed4d8690ca19bc0e323f6003207f142f759f

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