Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c71be23889cee31…

MALICIOUS

PDF

85.9 KB Created: 2021-07-19 08:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a06700b8699cfc8729ab7c634737ebc1 SHA-1: d4d001e2757ae9715c6edba4b910edfdf3d74702 SHA-256: 5c71be23889cee31befd9da993b4d3e3642b45aa003295ee2dfca7a2626ef2ab
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common tactic for hosting malicious content. ClamAV detection and ML classification strongly indicate malicious intent. The document body is unreadable, but the heuristics and URLs suggest the primary purpose is to redirect users to potentially harmful sites.

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://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094baefebf85---52260065430.pdf In PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/xonuzezarasasobokovawe.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210604123841548.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071691ccb29e---xaluz.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/napikokevudopukogi.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/9f6572de8e46af4ac8b52486ce098f06/belewivi.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/vorifumafe.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/walegazo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89cc13ffee---33868663033.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xuwigodonupapinuwe.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb31a41230---xinelogumolomiful.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a468277979b---97258848457.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210626072714_ihnjvj.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a024f2a88---62561795119.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/vopexe.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6444b6ead---fegavunebulefitumuval.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/tepapeda.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609408c93444c---72192586985.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54ebbce23---66328275406.pdfIn PDF document text
    • https://kopari.hu/files/file/11567586292.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c854cfb545d---dapidaz.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/54160714252.pdfIn PDF document text
    • http://whatdwellswithin.com/file/xivepofegotumulubejejilu.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/jelunufazadixasisoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dave+grohl+big+mePDF 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_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 10392 bytes
SHA-256: cd50bbff21919badd45dff2ffd9e3bef439e474a22ad791094e01500a47123c0
font_02_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 17180 bytes
SHA-256: b00b1bb443475fcdcfac89a17b26f5a8d5d5fd49a1b63788aec4b8eda434955a

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