Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea5b5761e0c1425…

MALICIOUS

PDF

93.7 KB Created: 2021-07-07 01:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e32f7e0430890b3e02e6087c7309cef9 SHA-1: 3e36adee6087d5867c081df4ab20595646c9cf73 SHA-256: 6ea5b5761e0c1425cec70876cbcd8c4a6c4193ddf239ceb58a491c531bd0c8e8
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of external links and the heuristic firings suggest the document's primary purpose is to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/st0pivj7nr6a99cr3a2k9rrcbi/18264495037.pdf In PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/416828c9de811be7c1448502d824d763/84272795047.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba50ab6f86---59228046718.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8344e97c4---zidavizusore.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/siluvazefigipozorijana.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088dc9735442---1394023929.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/bviai7k1pqv60jb1u77281juo4/bizove.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/29597872562.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/6qo5p4b31qp2u2ako9v988e55k/netadase.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22b00659b4---ripodemurobotiz.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/sufudegivi.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/laseb.pdfIn PDF document text
    • http://araonline.hu/uploads/file/47825611054.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/q9senj8rmq1j35k51lmsaeqnpl/foxezuwazusaxo.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9f46c481---29545959466.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/mamefudinepisukabapi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607732bd768c8---31724752245.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607383eee70a5---kipaku.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/gozoxagazavepasabif.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/19635341956.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/fobubafafimatobuwunaroxe.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/50296045787.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160842171c0a8c---mobirifitapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=it+connect+the+eyepiece+to+the+objective+lensesPDF 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_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 18988 bytes
SHA-256: c30348ba172d73a96c0b95e1a7133846482439aa73df6757f1f6040ebc939beb
font_01_sfnt_off00013972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13972 10608 bytes
SHA-256: 38281c268ba2e9f1c12277d9c09cd61619ba40bd65082681d17380b3ec3e4c54
font_02_sfnt_off0001515f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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