Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7d249a2810a4a7…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 04:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50ef25a3191ea27936ffce71b8316ddd SHA-1: 5a449e963a32aa1e4d5ba4a631f50871be74dda9 SHA-256: 1c7d249a2810a4a72eaf149ec3c7ea1e78c19bf00d5381ad641233cef5238b6b
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains heuristics indicating it is a phishing attempt and uses social engineering tactics like ClickFix to lure users into executing commands. The document body is heavily obfuscated, but the presence of external links and the ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • 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 http://tabletopad.com/images/file/narawerite.pdf In PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/buroti.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d41b802ab4312b631b3e307bcc48b69a/5577769093.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/32703540371.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/49681095341.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a29e619d1---39131670380.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/tajomawisova.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/sidibamuvol.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/u51p3epjtrrn8q4ib6vmdp0jfn/43388111693.pdfIn PDF document text
    • https://davaocarrental.com/images/file/14650503517.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/getimapedemis.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/7171884618.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/nesaw.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/gorukulexodenexakokez.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613488069f983---12845364079.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/zukopapefik.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/bisejuxanugisawiwuzod.pdfIn PDF document text
    • http://machin.kr/userData/board/file/xetam.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/pakufemosasituxigabenaro.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1ss8v1h7t56i247a2j0pd3jdv9/19017489386.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/61267524987.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/24147044209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+recover+deleted+bookmarks+androidPDF link annotation
    • 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_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 17932 bytes
SHA-256: 2a6d7c5c14212ff6965b3329cfc498724ff7fdb96552a7270db1897f44a627c1
font_02_sfnt_off0001110f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110F 10904 bytes
SHA-256: 36bcaadf0832d2f025bb59f7dcb03702aa3fe50f088d50e53d41e6740ebb9006

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