Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec5ddc38c5309c1…

MALICIOUS

PDF

96.8 KB Created: 2021-09-16 08:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af71f2f11104728c6b207abbea307477 SHA-1: 0352fc47ec6009b1d2f5704a5963ea3da5ecd184 SHA-256: cec5ddc38c5309c1e18404b3853cc8bdbab8a82a16c548f611b255613baf3261
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to various external sites. Heuristics indicate these links are on disposable hosting and potentially compromised CMS uploads, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • 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://garglob.ru/uplcv?utm_term=chrome+extensions+android+adblock PDF link annotation
    • http://tmacfashion.com/ckfinder/userfiles/files/saruv.pdfIn PDF document text
    • http://olympusflights.com/files/files/migegugowiba.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/wokumutakit.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/14171811305.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/rojabubufimasuvom.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/38065984483.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/43778793676.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/75490416642.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ksh47lhe9spemd8inthk8dj47c/45463334572.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142909b3268e---kajimom.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161371d1fb6325---70821446293.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/piwesewowuselavid.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/38537381294.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/kisabubadazunogukabol.pdfIn PDF document text
    • https://dm288.rs/slicice/file/luxazokosalulaloduf.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210912203104254.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161381f31aa1c5---sofadal.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/87295268120.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a07b1ecf7f621df5b31addf49409c809/rosiwufolugazofebobiso.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/xezagofijekib.pdfIn PDF document text
    • https://defi128.com/userfiles/files/gegag.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138799e6669a---52883530023.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_off00011001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 19792 bytes
SHA-256: a9e94f57df9e39a787066742ac15ff886122d32724dd8b41543ceeb4af817966
font_02_sfnt_off00015c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0B 11000 bytes
SHA-256: 9500b95df68c05161f4a59b18714102d9e80408b7cbbe7d22b746028471a9b11