Malicious PDF — malware analysis report

Static analysis result for SHA-256 84be2a9aab455245…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 10:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdbb7193fbb1ae4ca882e2a870e98989 SHA-1: 7759aadd6264b17b7f78df0636a506a719e56e5e SHA-256: 84be2a9aab455245159a50997d40fa698ea58475290228549d540307ba8749cf
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to phishing pages or download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5971

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://laborke.ru/uplcv?utm_term=archived+texts+on+android PDF link annotation
    • http://fskyok.com/uploadfile/files/jawene.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f93fa7c5be---guledevosafatefikotekeme.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/vepane.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/31960836284.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/lakalisexigis.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/97253682315.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/e9o5knki9e6f14lc1vtqt4fd47/45290557748.pdfIn PDF document text
    • https://limsurempat.com/contents/files/26762204388.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/68822964758.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/267b5f3b9da37441d994d38da4dac960/wuwalunanevoveguwuvigede.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/33668385159.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/najukotubifutovutamefaw.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/81565584465.pdfIn PDF document text
    • http://posuni.com/userfiles/file/24171626213.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/nufugevonew.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/fesubijaxakanujaj.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/gobomirugurelepifene.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/49548734221.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/40075524320.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/48086529464.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/tuvujemoro.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091004360273499.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/97720793948.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/20241695854.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/84774593575.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 10572 bytes
SHA-256: 4a1922d1b0c48e7f19bf221ed541123d08d78676dfa6171ffa938117f597d8de
font_01_sfnt_off0001264a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264A 19468 bytes
SHA-256: 0ebe2e465dcd8b4b87f4031bf728988b13d61079450937d82566562255e8abb2