Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f101e53b6c48975…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 18:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b2e517deca5c601c17adf518cf90ae2 SHA-1: 04ac39c236a82f287bfa61c90f60b0dd4c6899c3 SHA-256: 3f101e53b6c4897562955dc0fb12219584586141e773a248ed6050fe5961b720
264 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The document explicitly lures users with 'Payment redirection' and 'Recovery secret' pretexts, indicating a phishing or credential harvesting attempt. The embedded JavaScript likely facilitates the redirection or further exploitation, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://smidgel.ru/uplcv?utm_term=ftp+from+android PDF link annotation
    • http://texinpack.com/uploadfile/file///2021090914442623.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/sewupijawipivusi.pdfIn PDF document text
    • http://kelvista.lt/images/files/79682876364.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/89014264443.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/89943407162.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631502585.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/27063931244.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/bunorezak.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/tekawoxezerumiwikuxix.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/58062360711.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/7970559692.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/5193345811.pdfIn PDF document text
    • http://ttc-investco.com/img/files/30539611551.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/gusukobalikeb.pdfIn PDF document text
    • http://hrudolf.com/userfiles/69188819889.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/40193707121.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/davumububoro.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbd808a0f2---wozilimotuxupijofewure.pdfIn PDF document text
    • http://sartor.ru/upload/files/69280330823.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/polatawixukuzefewajono.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/be1142186ab07bf07dd16d84eba705be/56174899735.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/637006c904fb6888b441d2836eaa4e23/gowoves.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/tuxofajivaluzibuperatata.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 10288 bytes
SHA-256: ced18c36526d15a09b8853260df6d41939ede9e58474e502e02e4cee4451c058
font_02_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 18496 bytes
SHA-256: fe8439cf79f5f1bda0ca35d29782087cd94fdd7d3922d7ff1a0b405b2a6556a8

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