Malicious PDF — malware analysis report

Static analysis result for SHA-256 728dafd04b8c2b2b…

MALICIOUS

PDF

98.6 KB Created: 2021-08-03 18:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 382cd92002f98c4064de1dc15eb9172c SHA-1: ab87c5a3961b4420e4f969815f58d40c18f72673 SHA-256: 728dafd04b8c2b2bb3e3b861a4a29874e32f742267c39f019e6027fc0736f590
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites hosting similar PDF files. This behavior is indicative of a link farm used to distribute malicious content or phish for information. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/b6dvp6o7igd8idc9il1jub21ub/9304330080.pdf In PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6mn67f46r21lfe0gobmqdkkgp1/27024055418.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/351c4400ca7777ae9626107d3c16f590/42896800247.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/31003024094.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718dbb1a80b---64936650426.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2607a741b23428f7bb4bdc5c9e85fc1/matof.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/42fa3bcb4019e83085460b88aea1f546/gazojaduveneg.pdfIn PDF document text
    • http://potya.com/vupegolopavawoki.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160dad7b2e195c---71294858619.pdfIn PDF document text
    • http://bociany.sk/media/file/36415109457.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb07784b73f---7161486837.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa903c65bef---xokodegukanaxikovenodudov.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/furujaxoruwebupiguresawin.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/32f5978c873639058aec0aafe5903346/40190385185.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/vezumobu.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/ec20b4152b3784e22d0a46b6f7e7f673/66254500290.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-26/20210626202020866675.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/wewomiza.pdfIn PDF document text
    • http://hkalc.com/userfiles/puxetapal.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/58510239920.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/86449493586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=a+guide+to+the+project+management+body+of+knowledge+%28pmbok+guide%29+7th+editionPDF 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_off00011982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13199 11748 bytes
SHA-256: 0dd28acf45c706e6765cb6f833decf73f5ed07f76ba50ecb635ad78cebe53cad
font_02_sfnt_off00014d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D41 17816 bytes
SHA-256: 967d2c51ac9c0786670b1bab14a69bedd0efc20fc9253110724115c1dcbf44ac

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