Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3d4c8a3f2866ab…

MALICIOUS

PDF

93.4 KB Created: 2021-09-20 07:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e54850e65568201c82fa581853a52674 SHA-1: cf7af2adedc0a6ecda461a558101d6449730d2b2 SHA-256: dc3d4c8a3f2866ab71f923c0d235d793bad47a375e5274768fc757a01c89be5a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://irlanc.ru/uplcv?utm_term=how+to+crop+video+in+powerdirector+android PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161458dbd345ca---30062872688.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/30647157804.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/37660957708.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/jifinufoforumewewo.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/falejefilaz.pdfIn PDF document text
    • https://rajaunited.com/contents/files/wusobaxidibalif.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a68489330af7636286c13c975fbe148/93796082506.pdfIn PDF document text
    • https://led7.ru/file/96056140540.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/74753328378.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/fubalubegufimu.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/xupagafutupevukewe.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/95871570223.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/nepaz.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/xubina.pdfIn PDF document text
    • http://labonscafe.com/userfiles/rodebujapubajogo.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/43308901555.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/44809919972.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/dbdafbccecc6294a0edd94b6f6aa2531/28362588105.pdfIn PDF document text
    • http://stefani.cz/fck/file/74603640013.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/16851805853.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/saxibujokimuxopolera.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144cedf5c793---pefelojoje.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/puwarefudedoroxusovi.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///sepotez.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_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 10436 bytes
SHA-256: a62b715ef52ceb166214c25ca92f7f6363a130c0fc34ef70276ebc8065309249
font_01_sfnt_off000117b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B4 21448 bytes
SHA-256: 950182306bb97980361cbc0eed65cdf0003e4caab263c9853bc270c8587b582f
font_02_sfnt_off00015023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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