Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e34e8a996aff3bf…

MALICIOUS

PDF

73.8 KB Created: 2021-10-06 03:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 668668b75b77b2f5fc51f86c2e7245b8 SHA-1: 721acbeb05e956fee781fcb97e1581ed52ccad30 SHA-256: 3e34e8a996aff3bff32277b88d9e9fa959c564d73f0b6d62a36b6a41b04a59af
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, potentially to manipulate search engine results or direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=let+x1+and+x2+be+independent+random+variables PDF link annotation
    • https://marblobath.com/app/webroot/img/files/fakipevajavisokupapilisex.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/82747840445.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aeff3b3f17---puzibavevapukovek.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/tekarowosatifagujebekepaf.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/sobesikikiliditi.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/benufeso.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/pepivovesesegefavizokezi.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/1540678678.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161524b958ca06---36585383865.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/65375543443.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/97631170979.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3a17848a813b95a49e0ef47b0f415371/nixinorekuwa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343fa2793fa---watepememaxiworox.pdfIn PDF document text
    • https://tmtteks.com/files/pidijitetoxexupuv.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/futagipugalugite.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/jogedi.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/85584912569.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/86736781151.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/kululokiwuloweg.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/69979306226.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/91910985972.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/15884167406.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/67356362849.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_off0000bc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC14 10992 bytes
SHA-256: 414c0842bc13d0d50cbe6450c57822e8b96ca73d77cf46b666295e7204beaab0
font_01_sfnt_off0000d579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD579 16968 bytes
SHA-256: 0301dd964c7f6f8c3de27020255b722b8a8f8d9d8cfb6e1b38c9a8e8c6afa26b
font_02_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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