Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5086511f841d26…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 01:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 64538894beeaf69a49a2d7e2d5a22f7b SHA-1: 5e1cff48916c73297c1d161ba8a916929551ac88 SHA-256: ff5086511f841d26117dbb74952c14262456520056c6197623b611f3460efe64
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely serve as a lure to redirect users to malicious content or phishing sites. The presence of multiple compromised hosts and the nature of the links suggest an attempt to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b00a71a33---54122610328.pdf In PDF document text
    • http://maychamsocda.vn/images/userfiles/file/84735863751.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/novegebojinux.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedcf67892---xasunigukuperupukufikopix.pdfIn PDF document text
    • http://ekomeg.pl/Upload/file/24728814927.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5e7d9c129988b30ffc3fdb36e6411825/mogegizalepabebe.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106ba9b9c244---forilerazudubisuwep.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/59761783178.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e61bd226171---31031036389.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0f548ccc42c0acc0d6560d0653ddbb93/66709730177.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ea3f2eaa---96403518876.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/92128954760.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/72c0366e0018fb18eb6dec18e2fce2e9/zepazuwufufidebotutib.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/cgf9v37ga6s4gbltdd9214qiug/16526299424.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/81056997205.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e43c2aae2dba0f083c849815df568186/puzaxexazizumerusazavub.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161106bcac9b2f---95734899803.pdfIn PDF document text
    • http://zerosquareonline.com/file/23413664763.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/pivolil.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/41438761352.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/mikasopujosemado.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/jojuwa.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/20870561215.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/nemanebabusanuniwuxep.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/wubozobupitepuzoropavage.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce171c870b---lofetalitafobabivev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=comics+superman+pdf+gratisPDF 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_off0000cf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 11048 bytes
SHA-256: 607af7533053a77a15d794e5a7dc21ca6ca77d72567629d92c393d72808daf89
font_01_sfnt_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 18884 bytes
SHA-256: e62c7df6c392c4d8bf386ed8f4c2c405dfba3e74ee980d7bc173f84e4d0bda6f
font_02_sfnt_off000119eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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