Malicious PDF — malware analysis report

Static analysis result for SHA-256 4191ac9eb76ff041…

MALICIOUS

PDF

78.0 KB Created: 2021-09-10 10:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b26e159578e316dc454e7e261eef961 SHA-1: 1b30165da021b31d05f01385a22478ef13969bb0 SHA-256: 4191ac9eb76ff0413316393eb478253f4bc2ce84472010828f5da15ff553159c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://saint-party.com/media/file/62669863326.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acaa5d202d---67792705509.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/70201187089.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/tavapofinedomasu.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/xutiwevosenukapeduko.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed691eb4d8---bawolepuxeku.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/sugimitorusulim.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/94861362231.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/bawunas.pdfIn PDF document text
    • https://kawanmto.com/contents/files/fizibozozen.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ca719e77037a50cc6e42586133ad4995/fefejonojazodepev.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4qhihppgm149mpgmoc4itt07ud/lasipufajopipumibuxolus.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210908115112_sd4vd0.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/wenubujinolexibikejumutu.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202198148588582.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/15584529852.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/tafet.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/30319882062.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/punaparitunovo.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/sokumelemimatevazedex.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/vegupojubemuvosafe.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/piduweterula.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/baxesesibakatuminobowetit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+how+to+reduce+image+sizePDF 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_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 17244 bytes
SHA-256: 417c6f8059375f6e610d094771fd98b258a8963e35b7e9ab6e0ba16b34a274f5
font_01_sfnt_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 10996 bytes
SHA-256: 60cb3c7137049a0bcc91b5a68da7f46d0d89ab2d3bcef4d17b624753c6682ce3

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