Malicious PDF — malware analysis report

Static analysis result for SHA-256 903b5a348c4b37f1…

MALICIOUS

PDF

86.5 KB Created: 2021-06-12 04:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f04ac83b917dddb8fac32d752b81a832 SHA-1: d92b538d42fd735fb4b4cc8a6b3e92181db07ac7 SHA-256: 903b5a348c4b37f122b295ed72b52b5237bd4a669ff798286f9efbb0343b2be0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating 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. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://krisoc.ru/uplcv?utm_term=tu+mera+tu+mera+hero+number+1+dj
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d80da581a---65656516465.pdf
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/1brqhku7ol3aq612jqsv4olrcs/74214335475.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c8d1ca0da---nomefibunafobi.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608c62d8ea9fe---48333257041.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b66754698---8644778080.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/pqlfpnfrlan7usk4fsll25ed2c/wonibiverilatubi.pdf
    • https://houstoncoinshow.org/FCKeditor/file/59655325057.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/9f7aaef1527fb1fbf2ce6b64c6ff24cf/jijexeno.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2d41a4c5edac850e3fa04def47c3806c/12290729115.pdf
    • http://gelateriacool.it/userfiles/files/75669719945.pdf
    • http://axiomestates.com/userfiles/file/fedofalekolewizusem.pdf
    • https://ayurvedaemart.com/uploads/file/pesilamukinivi.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160866c6c8f93c---vevegor.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/fo9mcil8pm0dis6af30irq0huu/musirizoxixipetupavolim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea47.bin
0a41f0584a65b1e0d1ed4e5cdf4d18f210c353e81ba9b88e3d6adc1c00fc7755		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 5072 bytes
font_01_sfnt_off0000fb5b.bin
938daae1d42a8388ed1119ceb3e2e0dd859c36bf88136bc0386609590e3d7c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 11508 bytes
font_02_sfnt_off00012192.bin
9e8409b995ac2b0bb76eb3eb8dd1c90fa55d1c1c8a40bb5daa08ca4080948d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 18776 bytes
font_03_sfnt_off00013f35.bin
14ceb46914c51220f298f410aab14d424735f7ec32a59d46045b6453aacb242d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F35 2912 bytes

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