Malicious PDF — malware analysis report

Static analysis result for SHA-256 593e1aec365860b3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 18:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23a7277ea77a279fcf3cf180b14a0acf SHA-1: 6b3e2b7b6787605408473a746719440b7e761056 SHA-256: 593e1aec365860b33c8e367765c40234aa5b6952c38d68e6e5560fae0bf56f12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of urgency lures further supports a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=tanix+tx5+max+firmware PDF link annotation
    • https://mygoaltv.com/ipp/images/uploads/files/lafiwavunumu.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/laruxekujepewepixewap.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/febog.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/8570917041.pdfIn PDF document text
    • https://dhesient.com/media/15640553360.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/segefuxefekezow.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/32198855893.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/sipajelowe.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/kurimuxesufepumobijami.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/lulexudoxisafamoxi.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/safekogepujofitamis.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/17966217012.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d9dee44f---xixidewagamuxuxepob.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pulvo3iva3q5pei231nli13093/jamibutizumuruletiv.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/47638014082.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/95953469546.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612efbdd1efb6---75962868136.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/mofebosulu.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/21484448188.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/58709349605.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/pujabuvux.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/bovetag.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/52301872997.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_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 10328 bytes
SHA-256: 3bfc2896d703e1b88820f8c842347961053c02f29e3e29bece1f438795af44e9
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 19704 bytes
SHA-256: c97169e590064ee10505d2f3dfcd298eb9a7dd44d42f9c70d8b160f4b861b7e9
font_02_sfnt_off0001267b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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