Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ea009402e38090…

MALICIOUS

PDF

73.0 KB Created: 2021-09-03 17:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4db82c2dd8838ab2cb9d46f320f292e6 SHA-1: f7c320c887a11c1e2fd4258ac6fb62393d8d93bd SHA-256: a5ea009402e3809032c5af37ecee57c2a57e2be2e99ef5e3f91d09960d3c63d0
124 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV, indicating it likely contains a malicious payload. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous URLs suggests an attempt to distribute phishing content or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3916

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://inwebjor.ru/uplcv?utm_term=endocrine+system+exam+questions+pdf PDF link annotation
    • http://etalentlink.com/uploadfile/file///2021080704321168.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/55483154420.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/94947537028.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/65953650187.pdfIn PDF document text
    • http://gekon.net/userfiles/file/42057408654.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/48946426928.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bc5bc9ae34a4731bc6d347aa7a85847b/womuzi.pdfIn PDF document text
    • http://hibertek.com/image/files/20210831_195837.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094101a35474---vaxubaputevixisojawip.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/sotawu.pdfIn PDF document text
    • http://yuha.be/_files/file/napiri.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/28163907577.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/iurp5503cgkaipcmpt36536peb/sonas.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/vomafotezolu.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/madoteseludilutumi.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/89748224698.pdfIn PDF document text
    • http://szpk.hu/_user/file/39541883796.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/001026319d9749a41d03f98956c77387/gijewigagebewejurakosize.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf9e30b1bd8bd303e17ed2353d919fdb/4524992642.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/merisapobanakofawe.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ri6jv6guuusukj1o0v3sc40aj5/pisobesinoputigukedon.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/zogowojezidevod.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7bac6f9f1---faxobusufurubemiwelisa.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/98557537876.pdfIn PDF document text
    • https://etadelloro.it/images/file/54729344235.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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 11180 bytes
SHA-256: 96aa5070291933376c695fb79547c0d007ec5a11a97526859b0e063c1d6c0953