Malicious PDF — malware analysis report

Static analysis result for SHA-256 221d64e9b8236eb3…

MALICIOUS

PDF

56.3 KB Created: 2021-10-09 01:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bef24b2d2f09e5575bc3a5c884dc158a SHA-1: 6318260d6858a39facb3940abe4825fe8ec037ee SHA-256: 221d64e9b8236eb32669779cf0c3b5907c94ce7bb2b84a28aa96ed69f72880cf
162 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. These links likely serve as a link farm to redirect users to malicious content or phishing pages, indicating a multi-stage attack. The embedded JavaScript, while not fully analyzed due to potential obfuscation, is a common vector for exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6612

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=common+factors+of+28+and+42 PDF link annotation
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/9957191636.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/givilavapolavi.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/kaximelesiwevemixefe.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/16535791563.pdfIn PDF document text
    • https://el-tall.pl/pics/file/josanezi.pdfIn PDF document text
    • http://bluebossa.pl/files/file/guvepega.pdfIn PDF document text
    • https://protum.se/file/suvesopigavovubisaxe.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/nuvezojikadomiwirifofivaz.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/tomoloduzubikade.pdfIn PDF document text
    • https://airshow-bg.com/file/76725619866.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/84c70fa8938dc20033d4cbfd8ca2b76c/dowazikemefavemojima.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161464469d2c83---pafujofesuwubozegusifoxo.pdfIn PDF document text
    • http://life-homeshop.buyout8.com/asset/uploads/files/tokedunujeb.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161312b6b3a4bd---dogenotewon.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/vulevafodoxutikejonusunus.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140343114025---tigamojeja.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/8945906489.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/35073877555.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/8296701893.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/werovopezusevobero.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/89112140021.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210913020110.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/vovevurozesefivibidotako.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/zosabobu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be844e94e9---93045460957.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/81078013457.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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