Malicious PDF — malware analysis report

Static analysis result for SHA-256 e838cad360ab2ef9…

MALICIOUS

PDF

87.8 KB Created: 2021-09-04 04:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0198fc094b1d1d819f93e16258c08fc5 SHA-1: 67397ee6b349b58a1d93b381e596438679006640 SHA-256: e838cad360ab2ef952069ade696712e29738478278a6ffba08bb135816a85345
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 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 the document as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://mimpisiluman.com/contents//files/dulinekiponebim.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a42f6174b78---71865645178.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/716646855f04598414a245636cf043b8/71099938181.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/zezoxowexawogarome.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/ruxumugajigod.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6fkb51mf8p9dbkqskt0g6falc0/47943361297.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ba913e92cc4edc769629bdfd20e60f41/pubelaja.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/rirumaserotuwowidupudeb.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/pinidelomugurevexo.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/tobovabubate.pdfIn PDF document text
    • http://boxethai38.comupload/file/kodaxuwivurenabuzolumor.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/46639336273.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/53613063945.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/52944528069.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///terif.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/u72e64hsior6k0l3s6n71h4bms/52723161951.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/29be78bbb869a8f09aae92262c82df13/29798784681.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/dewageme.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/kibumuwipuma.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/10919827796.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/410450295.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b560fec25b94a4ae4125daaff3dfb985/30928763756.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/vuzulodabunanu.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/josubafonubijozokofuxewit.pdfIn PDF document text
    • http://packturf.fr/files/54471230502.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/pepux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=latex+include+pdf+add+page+numberPDF 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_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 10972 bytes
SHA-256: fd785216b81a5297e8fbda6a29b82d145a8c0de0d22257a037fda080adf4738e
font_01_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 17516 bytes
SHA-256: 8a0c73184888f03840dc9988cbd195d96e9fda6ad0b9964983610b80f70a8d19
font_02_sfnt_off00013944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1