Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1fe7e8027bc98b…

MALICIOUS

PDF

87.8 KB Created: 2021-06-30 03:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87cbf786359b9a86279fba41e411b724 SHA-1: 611ee6951a23e8ec8bd9cf400bfe7ab0f73de7a5 SHA-256: 1e1fe7e8027bc98be0eb19a44384ae0d50f022ca1e19e5533028c6e0b6c5196d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is intended to redirect users to malicious external content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=different+types+of+biomass+energy PDF link annotation
    • http://frigotechreina.com/userfiles/files/busolapuj.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/82781574047.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfd80bad3a---noseseginifowewaxuma.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m8sqkq6k11g2rhs35ti5vdknj6/pumek.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/03c49a9c02830c58516a7eda0f57234b/69979697926.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df34e0169---sevabozoxiredubuvuko.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a653fe9c04---xozudukawumilavus.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/dadg8d1d5kdal9dfcp442ig10m/10665482140.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/882e80c1afc45e39eadaf4614779f1ac/papugeguvimajodowiva.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/dirogumufuzewalazoxeki.pdfIn PDF document text
    • https://fultoys.com/userfiles/gorerisaseguduvima.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2047660645158fdc8aca6e5afb9e9f53/nepamiginepupijakukazal.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/941c694da0840dbdbeda71cdead27d0f/fufivegifovufosefawatada.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ed15260d03d4c27c149b54d8e0aa44c2/regumivunefiwinuzu.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/82121996238.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/48369906302.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/2d79de88ccaac5fea57f1e9d6fd5c7be/josomemetadutikepet.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/69m50rou9qbct937kvruhrjhpp/39560780884.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082a83f1d69f---4010242736.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/30963334445.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbd9c563ab---kumunojevowepemafabolif.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609019e668b59---sudurojulejerig.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/61377801232.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd850ca35---12228534009.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_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 10908 bytes
SHA-256: 55179e4ab16f03dbb06651a179547eb24a81638498d454e5efaaab2bbc52b9ae
font_02_sfnt_off0001254f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254F 17052 bytes
SHA-256: 753a0377618b6995157e78323b3988e0fde4ad51ea1930dea0571ac1d1505721

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