Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11768e432a47d28…

MALICIOUS

PDF

76.1 KB Created: 2021-09-12 15:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8683c700662628a4a371a3f95a5b03db SHA-1: 0b74471b6bfeab4a84a7333b2834bdbee7d7190d SHA-256: b11768e432a47d28483631e0c66c63a8e98f292becc60c3f67b1ba049ff7e495
154 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. This suggests a multi-stage attack where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 5

  • 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.
  • 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=how+to+stop+ads+on+my+android+device PDF link annotation
    • http://damosushipleasanthill.com/uploads/files/28488917893.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/72838883847.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/83095320920.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3346cbc27f07460c376419ac43885d4c/65808413539.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/tutatikuzofifuluturi.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/wosekivuvidakuputu.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210910084520.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4b26cd8be9415b18e1ad5148de0f89a7/luxuvib.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/92397619312.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/vajadamubozekuxiv.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/leratarafe.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/xedidiwaj.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/beduloxonupiremorowur.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/wevalakofejetomezamutuno.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/20767758547.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/75175961924.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/41179454211.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da41f16a44---22681819451.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/04b743fc20a4d2c38037f3a84319db34/913076561.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139efef90da1---sagabeduxanatunuvewi.pdfIn PDF document text
    • https://digireg.it/upload/bexokepozufabutof.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/nuwegudexuga.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/kaxozedazamewukijafo.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/48151114137.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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 10888 bytes
SHA-256: bb90e5b0033ee9501b60a1c185f6ea59b62f1765e6bad6db3d3156b1240b5df0
font_01_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 17764 bytes
SHA-256: a35514d51d9423ddc146ba4aab7f1e67dea8a9058c64201506fb6e2f0359f601

Open this report in the interactive analyzer, or submit your own file for analysis.