Malicious PDF — malware analysis report

Static analysis result for SHA-256 be461dfe1417a7f2…

MALICIOUS

PDF

92.6 KB Created: 2021-07-31 14:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9078f6fcac6e24e78aba4a322a4ab46c SHA-1: e7ba64a4dcbc20b4ee46862e2e78b49deafecbc0 SHA-256: be461dfe1417a7f2660c0a47e0931390614864fb01dafce67fa94a8746f09bf6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to compromised websites, including those hosted on WordPress upload storage, suggesting an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zebcom.in/userfiles/file/gapabesuvisidopuxabo.pdf In PDF document text
    • http://cocoal.com/uploads/file/ruwanokerosinebokewumo.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ssijnr3odtirhi2euni5qap24f/83096820084.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/7331412107.pdfIn PDF document text
    • http://bjjiffy.com/upload/11597128728.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/45583350260.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/xumujebuwuvuvo.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/98328761220.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qg4hcmlf3es90e61isuckghib7/zulubemo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6f351e10bdc5495c6c0d63a68ce649a3/56058466632.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/sazenasixuzorekep.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/61316c7e360d416c6fddd66943bae1d9/95516082678.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608938f8a2c35---83533231322.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/91181346044.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/zizujanuzo.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b1bdbcf0bcdee6c44fe52070eebb531a/28583787404.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/kugolunomefelodusosowog.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/pufeduwit.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/88070704214.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/68b269829a3b8039886fa6029116aba1/92840840884.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/tepunigutipemodovo.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/42602255913.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/1472f582fe8b0ed65c80479a26356456/nekekazolexidinoped.pdfIn PDF document text
    • http://crm333.com/documentos/file/71816908711.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/gepomifi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4d4897bfdf8e12e954d154e457e7da57/pevekovokiw.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/20643354161.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/kozonenaninoxuzobukeru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+free+slot+play+in+vegas+2020PDF 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_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 11032 bytes
SHA-256: f414896b9cf31552ed8e3c63368696c9b228f1c1860f7f882babeb0374ef8b8e
font_01_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 17044 bytes
SHA-256: 2abcde2b20e8b927b2ca3f9a0c5cf078e858fad4ca0d215eefdbad399dc0a56d
font_02_sfnt_off00014b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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