Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0897ddf98ddee2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 09:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b030d48a189450efa3d7c8318eab463 SHA-1: 288508cb329dd6c309990d36d444631d8c601b61 SHA-256: fe0897ddf98ddee25056f52a026d94b8bf29dfb0e13396c32d63ce50f72f7198
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous external URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=identify+an+example+of+hyperbole PDF link annotation
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/24175777713.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/betawonawokefe.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/28845362527.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/metovunuzovo.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/57181141392.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/48573307158.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/92998954294.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/1676159498.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94af539da---bivegoxu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/fexikajitewuni.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gl1q5aage5nheonlbppi2gp2kj/serijinulewo.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/dewuve.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7baef1425---48656302067.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422924c99a0---gosoraxanejakaroxebujabu.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109132248096461.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/44318102097.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/2782059649.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0d691b604---vamomo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613349d2b43fa---renukasejowogorarekiwezir.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/22013962208.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/memoluzima.pdfIn PDF document text
    • http://prosquash.by/data/27268562485.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/16988215773.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_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 17268 bytes
SHA-256: da87e623da8f5ff10dabc07bbc7badea900ee355b7d213a066bc34ca9a301e9b
font_01_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 10900 bytes
SHA-256: a6f194a1b5fc6e10b7e1ea1972e5647db72aae93d2eb7c1d86161293cf101e9a
font_02_sfnt_off00011ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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