Malicious PDF — malware analysis report

Static analysis result for SHA-256 91770375772b051e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 01:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24e7f1edd337d09c08a0d477ae8abc09 SHA-1: c0a016ede21099b319d79a666f17904603df9c6d SHA-256: 91770375772b051e67b745b473416be0f2efd39d423c3a4419b8300a8fa4f40f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised or disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://jiendurancecoaching.com/ckfinder/userfiles/files/kovilabuli.pdf In PDF document text
    • https://officialbacknumber.org/editor_up/69779363043.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/sevoxularonabodakakexafo.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/50532083284.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/dibesobezepimataj.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/23626364588.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/zesefutijojuw.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/safitolusagav.pdfIn PDF document text
    • http://skisun.it/userfiles/files/kekexolimawexinowexexupop.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/xonowazebamifojawal.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6ed6f19d275d912b92fd5c990e81a9f7/sobemotefudi.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/gutabizunexenifu.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210916225854413.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/94861278763.pdfIn PDF document text
    • http://atomleasing.ru/media/File/rumikusuxifa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/11b3f3c23852a8112e4c3839d1343202/vaxatoranofe.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090503544654.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/xavariname.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0efd67e0118dcbdb229ef7911ce3e96c/logamare.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/kudemigigopogebawebitasu.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/wuvoba.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/dirigejinalexegomojoli.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16149d97191be0---7154418826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+last+jedi+screenplay+pdfPDF 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_off0000b2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EF 17668 bytes
SHA-256: 50eeef54ac20a2fc6f04d76490de6ea941d39268521421b422eecf0fdd63e935
font_01_sfnt_off0000e037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 10804 bytes
SHA-256: 99c1d464fe7a2b5e085933380eb93cc451935da538b4fa10257b8daac49efd3b

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