Malicious PDF — malware analysis report

Static analysis result for SHA-256 9986bc5c2d7e37c5…

MALICIOUS

PDF

85.0 KB Created: 2021-09-10 09:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 360e2f3c116f6cf784d4371b47ba00f0 SHA-1: d2b53f6e8790e8a23bd6b13af94bcafd0828d207 SHA-256: 9986bc5c2d7e37c50ec672a49bbefe623fade0c70defc521eccc2b3b50322393
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to external, potentially compromised sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613453869c582---fukafokanu.pdf In PDF document text
    • https://ccskin.com/geektic/files/mutupofasurasotonafi.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d02132c18---vidilugipajagamanizatip.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/78993114198.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/gomopokepekifosasuxan.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/sutetuzifuw.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe68d72e7---gexoluxapedopuba.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/58260978321.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/0d785ca97fd0c2de66dc22ec44ff5a4d.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd8f694bb---52979232779.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b942c1924b5199c53a0f6ef6fffbb781/nubinigak.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910090022.pdfIn PDF document text
    • http://lawngo.net/fckfiles/silot.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/69816039380.pdfIn PDF document text
    • http://hzqzg.com/d/files/37821966115.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/tegedubitibetapo.pdfIn PDF document text
    • http://mega.kz/media/upload/files/92062893822.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/91b0dc87844839bf0138962ac3186451/18007852436.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/roxedufanuwaba.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/53428066288.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133af18f081d---85722677766.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210907020212.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090410344167.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/ponaralixizironipupafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=de+bono+hats+theoryPDF 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_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 17380 bytes
SHA-256: 52307fdd5372f33f526dc2b2a5cc4efb35d0b55a68a59b56a0f98d2bd90be4d4
font_01_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F20 10320 bytes
SHA-256: 378c5d40b7b2ec89b2d9ea4c01d1939b7dc56877d44222ad228dd1f52cbec3e7

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