Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e54a9151be4d0e…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 22:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 36e4260c066cf183a25b3e4998575ccb SHA-1: 3180475abaa72b78652ac105c84a0607cfcfb171 SHA-256: 94e54a9151be4d0e8444f7ff17a887692fd7f4c9be5c9beb1d9c1abf8cb61afb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous disposable domains and compromised CMS upload locations, likely to obscure the ultimate destination and evade detection. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection, suggesting an attempt to lure users to phishing sites or download further malware.

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 http://casaatlantida.com/userfiles/file///sifizidu.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5118ea0c9a---tovulatexozalovof.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/61502629072.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/winogonabugebatilib.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/ffbdc970c68e577efd2c1b3bf8efb59e/lotepaximilapadaxenalix.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67fd55cc650140db533f6212d7639bab/31958890057.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0ffbdfb460d8dffac1a3925e47189fcc/31756207495.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/11krq47ufkmpqj7glh6981pnge/jofejuwev.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/motakefemezitunod.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/tefatuvejudozebojatozozez.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/r7iasjhl3k50hf42nj4m06skis/89192284316.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25a8e2577---39500512230.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210508185621.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e74dc6535---47016706537.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712020d7be5---6991677012.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/3b4gmu7enck4c63smus7o2sjf88o2a8k/notugisogopovov.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1a85bd19d---jonazufut.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nv2p8o5414d8sn4oca8n6judo4/roloxowosewolaw.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/20152122488.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/wekomi.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/folunowelubitew.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/85896eac4916e16b8e4a2dbafc0d4abc/3715376845.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/87470599941.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/568f233d51dd4cd522a3bb0c74b05a30/14734445248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=new+leasehold+reform+2021PDF 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_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 10680 bytes
SHA-256: cf55fb66e6241541bf26883714e44c8458569d92eb09b1245f51af697e1a7dc2
font_01_sfnt_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001240d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240D 17148 bytes
SHA-256: c4b7fb7d5e7fa619babfb851d95534ec44eff61fb54a8efd1b69d19f98ecfa28

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