Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90e9374f0f9d1ac…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 13:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6702a2c9f834ed57059bd40ff2c9a40 SHA-1: ad4c0f722b368b83d7b23881f563d215979e3939 SHA-256: f90e9374f0f9d1acc6de693e618a780db5f87e6228c9fbe4140743e8a535b3ff
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://autopits-directo.migrupoq.com/ckfinder/userfiles/files/jagazorojixofododexudu.pdf In PDF document text
    • http://saktigroup.in/uploads/23530189214.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/32489402116.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/2469851213.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/1460194990.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/sokekaborekekeza.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/pobuxolef.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574ac5c058---95914000562.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fecd196325---97558471088.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/rikosozenameselufeza.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/65762788331.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614777a5f0d64---98859286296.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d13bb816---fijerob.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/lofasu.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/lizusofemusekilasixazurev.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436b37bf227---bogesenupipolikemugabuza.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d89b3eedc38e6d830ee2680818ed3b5d/wasef.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/39161474093.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/6566620704.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/dekebonukejuzarasor.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/purav.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/jidexutakorarijave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=remember+the+time+protecting+michael+jackson+in+his+final+days+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_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 11588 bytes
SHA-256: fe23d8abd87c7fe7347dd71a68daaf21a49549d5de2a7dd12ee63c3ed99c5b99
font_01_sfnt_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 18324 bytes
SHA-256: 015faf8767de877da8f2e08f3de913eee415fe3974c4636cb6a1d28cc11d68fc
font_02_sfnt_off00011d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1