Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c6b31d112f2273…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 03:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c195051b8c2b69709e18d51717423d1b SHA-1: 2a1e53d1d910bdf0c3586dd1ba757743ac7923d9 SHA-256: c9c6b31d112f227361baf9700f80788121490a69846104e2a580df412cf14152
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF exhibits multiple indicators of malicious activity, including malformed streams and a high ML classification score. It functions as a link farm, directing users to various external PDFs, some of which are hosted on compromised websites. The presence of a 'download button' lure suggests a phishing or social engineering attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ride.hu/images/uploads/files/64799282709.pdf In PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/tiwepenikunufirovorej.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/tudowasakolereku.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133de73b65ab---1674387946.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/selunoremez.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d044ce8140---gegesiv.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a4872e71---65015150243.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec92d3da5f---31979457518.pdfIn PDF document text
    • http://domainecomps.com/documents/files/38242238409.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/vetumunowup.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/fosadilatalezebinelolib.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/zolapi.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210911011014.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54619113628.pdfIn PDF document text
    • http://elitvorota.ru/f/file/zesivonapijokunudoki.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/lubutejesixareronuzeju.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210916222822.pdfIn PDF document text
    • http://rococosofa.com/files/files/xazidarile.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/06/99268293889.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/vefozosegepamibebu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614692c67a4a6---pibafizuxozif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tattletail+mobile+apkPDF 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_off0000c6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AF 10236 bytes
SHA-256: dcbb54bb7e56dc41024f869c848057f52965316e7691885489022ad6b2aaffe5
font_01_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 18328 bytes
SHA-256: b031c726683c9b9b51ec7f9504d1dd30fe7d73641acd937eeb7bc6d843dd7a08

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