Malicious PDF — malware analysis report

Static analysis result for SHA-256 77038e09bf224229…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 21:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 36e0b8fa58ff71dd6a7ab44e45158eb7 SHA-1: daad958d327e0e1238524873ab16c56ff16ec4b0 SHA-256: 77038e09bf224229f6e19bd0b1e460b06e76c3a8eab443b45202508c2a462733
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inwebjor.ru/uplcv?utm_term=avakin+mod+apk PDF link annotation
    • https://flavio-tonon.it/public/file/wovabelejebufuzek.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/filidepupa.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/povilaxufukudatelagipa.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/gufatev.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/4243949795.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210910_E74D40B21AF824B3.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/dusetodaguf.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/28670107690.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qppnuo0co3ntjbng62mv4t0khd/51698945271.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372e3e427e7---vajutimuv.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/damimumine.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/99261102947.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/xomubixasanukiwumidoja.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/likig.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/37831719299.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/61044134321.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137959f22562---fozarozoj.pdfIn PDF document text
    • https://proxus.nl/file/28997052604.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/69334342034.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614205552cc19---80247783308.pdfIn PDF document text
    • http://flexa.cz/docs/file/wisog.pdfIn PDF document text
    • http://tencanpowder.com/d/files/xasomen.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210907131302_1668037750.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6e79c4255---sedajebig.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/jigumig.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 10148 bytes
SHA-256: fffa3274020f967296a191c06fcb1cb40c401ab37dfeec0ce78d349d565f36b9
font_01_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 24884 bytes
SHA-256: e10eb11fd84e60119b009d22668acd04e3f9a5c782064febff438565804e5d02
font_03_sfnt_off00013335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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