Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1c92113807a8f3…

MALICIOUS

PDF

94.3 KB Created: 2021-07-15 11:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7c18dcae67cecdd075a86b76258c6e75 SHA-1: e6c7bc052bdfa897f31ebbf7ea2167293fb63579 SHA-256: fd1c92113807a8f3180e1645e413c2c140dbe7327db6935cc8bb58b00a0e7b9a
156 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 phishing or trojan payload. The document contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, likely intended to redirect users to a malicious site. No scripts were extracted, but the structure suggests it's designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3f9a0671---39263631622.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/d53b22de9ca79ae968a395a18a1b42ca/51164327208.pdfIn PDF document text
    • https://infotechbg.eu/file/71668964183.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210623195412.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/dafixalapakafuxefiru.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750a8a7cd29---bafokazo.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/86106187004.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21655c4a67---gewojokumesumumodafizi.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/48934497270.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/26543969090.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/rajarapozexafasogup.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/9ec5f18a3ade2b52daab794239a2fdaf/zaranejorud.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d1df5be62---xifusowu.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/gujinoro.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/82322268892.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/gedurexanize.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d65c2ee7ac5---simobulajeporogulawu.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/vuradeliwuzekumuzo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7eb2bb605---14019113603.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/70766223165.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160860100619ef---jetuwobanipodabuxalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=champagne+cassis+cocktailPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 10844 bytes
SHA-256: 703eb5ddab32545e3912c1d973d3d6adeef7dcb5c9922d4c71693d0921c7e401
font_01_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_02_sfnt_off00011fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 20484 bytes
SHA-256: 6d24ee7a3240c71788cb2914264e88b09528f5168aa231a524d53a024ac2a4ab
font_03_sfnt_off000153e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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