Malicious PDF — malware analysis report

Static analysis result for SHA-256 53be06808fea91d2…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 20:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11a571df5b0ec252102aa1ae4eb41ab4 SHA-1: 48362bd508c0146a3e82e5244cd56a5291af56a4 SHA-256: 53be06808fea91d2f512b9145fd5890c5cbcaff739ec72fc7e488281e7433654
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4752

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=password+manager+in+iphone
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/93c615bfebe2d96b594a5d316d878046/10209706459.pdf
    • https://micro-logic.ro/images/uploaded/file/19960192100.pdf
    • http://svatba-emi.com/uploads/pages/files/90703190160.pdf
    • http://www.focitabor.hu/userfiles/file/3594070230.pdf
    • http://alrehabourhome.com/userfiles/files/59258410279.pdf
    • http://tgtech-auto.com/userfiles/file/vibixaletoro.pdf
    • http://clubsahdianagalati.ro/upload/editor/file/53608017710.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/42698655412.pdf
    • http://objets.immoweiss.lu/userfiles/files/matamexufibolonipuf.pdf
    • http://www.benyowsky.com/resources/files/gojebemugubuvireduk.pdf
    • http://geometrarontani.it/userfiles/files/peposidu.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceec789d3d---temudavoleje.pdf
    • http://notariocprietoa.com/notaria/documentos/files/renifupajisemewiro.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136781d48815---fofefapufaboroj.pdf
    • https://zzhqhi.com/d/files/34010034960.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ffa476289---sojujukefonikopagabajan.pdf
    • http://eyela.kr/uploadfile/fckeditor/file/xuwazefajapepu.pdf
    • http://myoffice2561.sesao33.net/UserFiles/File/76063226547.pdf
    • http://pitchdecor-construction.com/user_img/files/roneneg.pdf
    • https://geneolock.com/ckfinder/userfiles/files/gevewadipaminok.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/68521897171.pdf
    • http://griesvoegwerken.nl/UserFiles/file/getukufedep.pdf
    • http://commune-bourre.com/userfiles/file/fapanomulejunuwojoz.pdf
    • http://susasoft.com/upload/userfiles/files/44794750191.pdf
    • https://bocrangsuthammy.vn/upload/files/zizejerubufomujetidarire.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 16792 bytes
font_01_sfnt_off000100d2.bin
1a080c1ea17093c179b1ae561df171ac1cb7dd426e9d60d3e0ee1b528778f422
pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 10784 bytes