Malicious PDF — malware analysis report

Static analysis result for SHA-256 5171e834f991146e…

MALICIOUS

PDF

90.4 KB Created: 2021-07-30 22:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25c2d373c78ade9d9b3a0821a4870a36 SHA-1: 191c73660fca8e6e5afa19cddc2097622b6cdec2 SHA-256: 5171e834f991146e7e25270039df29f681dcc8f0fbe93a0c1ea4a98ba5101f22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The presence of multiple external URIs suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=why+doesn%27t+my+kenmore+ice+maker+work PDF link annotation
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/272bf32c5f7a1923d06eaaba7280b9b9/81513258134.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/7600055643.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/8711e68d684a6780cbeaa3e1533c422a/gorenutivezugavovinekorod.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/82629341532.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/8b65b3ab87cead8fdb9ff769f0d15ab4/kurijisoritepopes.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/dimumevomerabut.pdfIn PDF document text
    • https://o-dance.com/upload/files/taxofizur.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210714061535.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-6/20210506190802631552.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c668ec4549c---49152552799.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/foketekukelotumuv.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/7b23c4285cd0e2630125c62bbe9e040b/nibasidapozatotenipife.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/laakt9b2bovu6p0srscklj95ab/207412181.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e3207b4413400c57fa970107e7d2b2a7/kevari.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606d313c656de---2798271542.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/29068893211.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/69530842466.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b170a7602b69f88153dc269182f28fbc/vurezugufolofagukirirageb.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14320730070.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c216fb96d6f---32594828834.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/rivupetugakubel.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9d1c1335ca886b7a9434aff1f943493b/rurenaxa.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/wemot.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_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 10908 bytes
SHA-256: fb18d4593febac7aa719ff8b333b6a8ade8d5ea50a5649f811312489008f4cde
font_01_sfnt_off00011693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 17296 bytes
SHA-256: 66c5980fe9ac4048f4b423ad5c7d08ac2c1508e45473c7b81f7d5530cd20daf0
font_02_sfnt_off00014387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.