Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4e21983c040881…

MALICIOUS

PDF

101.1 KB Created: 2021-06-28 16:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e68b8e305dd10dc8d1b623ae862dfed6 SHA-1: 2bbac7580981da589c1acf0bcadca3dc2443051d SHA-256: af4e21983c0408814061def269fe676f6093e5ddd980e410a52638c597c92abe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to various compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/p0aldhf64cphkim9l99k04gts0/zaxuzuzaz.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/jamejonenejoratebulamijut.pdf
    • https://delcinfo.ru/img/files/files/299693227.pdf
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jozezekisaz.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0f0db83e---nujezezaxibezozulamemu.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd0ac869d---woripaxoporokavu.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9ff1ccb10869dc4036eefd7be72bd6d1/xemobiw.pdf
    • https://delphin-bau.com/ckfinder/upload/files/98228314031.pdf
    • https://recapress.com/ckfinder/userfiles/files/44532027646.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c269ab5a---79805142240.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/5a24a4754b936fd8439d5b8709de35ce/kidox.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/74b7be688e0b3d0e8745c80c5c603158/mojewetodatirerevebawiduz.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfcf36baa---80703084662.pdf
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/teminaxunir.pdf
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/teperaxavavivumiravobod.pdf
    • https://fontaine-eva.fr/userfiles/files/nujozabizenobebudejo.pdf
    • http://fogathajtohirek.hu/fckfiles/file/nivin.pdf
    • http://adabaskimerkezi.com/upload/file/8802269275.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/27247082313.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33f342a9d1---wuxogoxinap.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac06534e3---morawutatawelela.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608180dc23d5a---vojufuvavavuxexarumix.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a99bd588255---guzebaboserimisuvem.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607548ef1df11---6935575263.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+power+of+psalms+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129bf.bin
09c58e30af79aaf9bd9b8c0b4006112a302d06778edbe1ec8ae76d627932488e
pdf-font-stream PDF embedded font (sfnt) at offset 0x129BF 10516 bytes
font_01_sfnt_off000141c3.bin
dae752bd79a533c86f2b13b6f7d99fc935684d0efc54ab655ab134a098de8a84
pdf-font-stream PDF embedded font (sfnt) at offset 0x141C3 17468 bytes
font_02_sfnt_off00016f12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F12 16792 bytes