Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7e4a59dc9046f1…

MALICIOUS

PDF

96.5 KB Created: 2021-06-27 14:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1c09578acaef15196f22dee8b160108b SHA-1: a1cc84b6cc5d72556d15541e050ddffb2c35177b SHA-256: dd7e4a59dc9046f1002a79b2104ab13663f009c4933e6132b391e38c5b897bd5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://cukiernia-waltar.pl/qcms/userfiles/file/fizadutapavevowuj.pdf In PDF document text
    • https://petala.gr/userfiles/file/74033263103.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5dc160975ab9b9c85849b1caf09655d9/67626329667.pdfIn PDF document text
    • http://sukhabalka.com/files/file/xanixigivejemogu.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/widinuvetiwupetegodapobog.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/546f658f2d66c017e8fb10579ed114df/71339004842.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9f35fa633843180427ca156ccebcace8/fibikido.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b836a34234e---97927050779.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5a11211a5---70190875735.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27105989bb---mujoxolovug.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba633a1d985---molixez.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/20439769180.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c29185d1f37---23867721321.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160775fb9806b1---mibugazezula.pdfIn PDF document text
    • http://peaktoppet.com/ck_imgs/files/1046013283.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b55d09f71074e9c8bfc5da86c3e09aab/wixujikibe.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/85861391982.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832683dae4---49094036421.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607964f0e5775---34030794813.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/mekeojf87vmrfkcj79n9n07jg5/76357633444.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608931b5615c2---38242372244.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/25153237704.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a36cf00fb3---monepibojuvegilexavuba.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/julodomuf.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4020a626032ecbd493fa2ff9702bf2d3/vokarukisedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=love+poems+for+anxious+people+pdfPDF 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_off000113af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 18340 bytes
SHA-256: bca2f088ceebd017818411bc42e18e4daa33ca8d12d27faa22a3fdb134606106
font_01_sfnt_off00014395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAC 10788 bytes
SHA-256: a83076406f4674e5c2c53c5017f2e32049106a083ef8a950c6c8752af48abf4b