Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f288886f77eb94b…

MALICIOUS

PDF

109.0 KB Created: 2021-10-21 13:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 21fac6d5d23ca7563b95461fd7c58468 SHA-1: 26f7662b448aec336d882055fac2222270c3771b SHA-256: 1f288886f77eb94b0eff18b2cf5a2731c6c0ee0730a08b7db3428c6dee125f1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to potentially compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://chieusangducphat.com/uploads/userfiles/file/63108269962.pdf In PDF document text
    • http://tks-forever.com/upload/2021/10/17/file/29327158004.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/fovizizuwodoziboxozo.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/6017886465.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/refukanomuzolexekuluj.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/83861756853.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/15548772793.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/fizubesakexomopog.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/powesoxosozozugetoxinapuv.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/zelasivuxelapozilago.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/wibepete.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/59064893786.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615809d873137---nomibamam.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/bagiwinixeli.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20211008084546.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/786ce1112ecafffd1e16e1aac41a5bad/rikoli.pdfIn PDF document text
    • http://bubb.cn/up_file/file/66885782229.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161344bbae4e8c---24284310625.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/bagovuxemidival.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/bosab.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161661dadd8be7---vemig.pdfIn PDF document text
    • http://iphysiology.ru/upload/26726141273.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20211010_C93E2B7927E60111.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/23D8k0Ec_6w/uplcv?utm_term=sher+on+husnPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/41566464831.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 9984 bytes
SHA-256: d4ffcbf036935dac7d5c3659b29b6850c1562d1cbb5b4a0aa024fb2298886f45
font_01_sfnt_off0001414e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414E 21292 bytes
SHA-256: 519b4e2a6bb90ab52aa095366bd7ce7a25058b3592732709cfbe251646fb543a
font_02_sfnt_off000177e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177E8 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78
font_03_sfnt_off00018d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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