Malicious PDF — malware analysis report

Static analysis result for SHA-256 c885fb8f005fba0a…

MALICIOUS

PDF

82.6 KB Created: 2021-06-29 04:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e12dea7d23f5e5ed7a02ccdeaa49a6e SHA-1: e12fced447b7d326b2eed98ef0648426da365ba2 SHA-256: c885fb8f005fba0aa279fd6624d58b6fb9a7012008c7c2370ccd78f027769925
176 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and IP addresses, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using disposable hosting and link farms for malicious purposes. While no scripts were explicitly extracted, the nature of the links and the overall structure strongly suggest an attempt to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160be87523e5b7---77756228088.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bdd4bbc86c74b244911e4b4e232ffcd5/65797026381.pdf
    • http://pkynfe.net/userfiles/file/99896394734.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/libumemuwoseralejojekelux.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63be09e57---vodugugajukas.pdf
    • http://orderbestwings.com/uploads/files/4743271529.pdf
    • http://manpukuorder.com/uploads/files/rogekenejorajo.pdf
    • https://antae.be/app/webroot/uploads/file/kinimiziporekefasu.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b146324e1---lakedamudejurufokogakexo.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160722bf10845d---59855146058.pdf
    • http://bixenony.com/userfiles/files/kuxonogix.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/40abb742bc93d1776f77a661e64c80a1/88525550396.pdf
    • http://oio.cn/uploadfiles/files/lakekapowawovoget.pdf
    • http://ahlhy.com/uploads/file/290848183643.pdf
    • http://asahiru-ban.com/files/files/solejas.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16231713449194.pdf
    • http://fxmeat.com/upload/file/9e51f84d419b293158684b7c5d194545.pdf
    • http://work4shop.cz/userfiles/file/gevozemalafogesufawegop.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210530090920.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/fjsdk9gguug5obg352arnomah9/6632824347.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7961ca53a---86902853214.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa11e4e65---foruwuwenem.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=menses+tamil+meaning
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e097.bin
f871191f9a3679c4849be376a3ae9e1f3b01db82de2f3e36c0debd6043bd6deb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 10224 bytes
font_01_sfnt_off0000f77c.bin
0b5c8d8ad533a597591153f26249796911a00190cc5d4bbaece8b81689f779e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 16864 bytes
font_02_sfnt_off000123b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 16792 bytes