Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf0a18dd1a9853f…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 14:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67777c9d80592a1e06ab338e6b9d706a SHA-1: 832e0aceb969f2f0e986f2444f9c343913dad239 SHA-256: 3bf0a18dd1a9853f02a5dbfdb41c2ccdea43a69fb8a5922f97a67b9aae17e531
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d5b6e603de488461866c32372bce80c9/72480013090.pdf In PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///567409104.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/83db46b80d052719342b240564d0f1c7/64781385191.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/jubukujepiwirig.pdfIn PDF document text
    • https://akemi.ro/hirek/file/61963573874.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8e36b07bde06ec153a94da041c804426/binapivivugijitutebu.pdfIn PDF document text
    • http://gibisch.org/files/files/zemukafopivekemometix.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/wifovu.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/wufevagirukulizasowe.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8709f92a---62917466405.pdfIn PDF document text
    • https://wittnebel.dk/file/6862431788.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dddc59061---kepigisozuxita.pdfIn PDF document text
    • https://network-italia.it/file/57314254122.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/xomef.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/wanugeradojomukalajorob.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/bexagi.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/vanafekis.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/vopopadeg.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/jadibik.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/25282712127.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143501497c76---34241833588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=where+can+i+watch+mulan+2020+for+freePDF 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_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 10852 bytes
SHA-256: 0e0e07581de95b642cc291cf011d335a70e3315c861c82de3076de82c7f8ef8f
font_01_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 19568 bytes
SHA-256: 4980132624781f42d48693f264d99d0d407cfccdf0b6a79e5ef30351f01bcadf
font_02_sfnt_off000137f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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