Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2a3822f39bc938…

MALICIOUS

PDF

73.9 KB Created: 2021-06-26 23:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4003a2331f9b336f3af0979d594a39f8 SHA-1: 9dff33624f0c1f88927c91bf72fab9499796d83c SHA-256: 5a2a3822f39bc938756d073017cdd61b04fecbe97ba1a1b270c36ed77c32fbf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://bungefamily.com/clients/5233/File/40036878202.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a1803b0d---jixetugomujoboborurodudu.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d08964a662d---63312869859.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbf9c0f93d---95947826167.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/aciv15qdg7hm7fsde745idi9jj/18222863600.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/f79175b197a84c3b7abdfa3e7dffb29a/kafilurabigoledomomej.pdf
    • https://stbenedikt.ch/userfiles/files/satosamasul.pdf
    • http://caycanhtuyhien.com/uploads/image/files/27088048389.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/564fab908c485481a69d49efc945166a/talipijupadarorimafa.pdf
    • http://uralinteh.com/uploads/files/tiwodibukamidaza.pdf
    • http://dekoblickfang.de/userfiles/file/43020325650.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/350eeb7e7b88f98640c87b12601046d8/bubodezopun.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160815d81ea20f---97893157041.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/88ee14777ab38970d7c711198385f68c/4660012359.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2ef4f2a99---wutejomekisujit.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d5aca277cb6---95299778114.pdf
    • http://backkwang.com/userData/board/file/tabukore.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a23286b119cfbf0f4638a2bb032888f0/domavetusiba.pdf
    • http://fashioneducation.ru/userfiles/file/nifalaluliwewodotovenupe.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fde5a5903241e11817f94e8d45eda0fc/30487513749.pdf
    • https://agentcctv.com/userfiles/file/gubajadulafodinujemajaza.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/3e609d12758966f3ca2f2fbd1cd0b73e/57284105958.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2f2097f1f6ac12553ef85a4b5a984359/vezuxatef.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5baff86d361f3ab52a238f23b17034d5/11098814766.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2ab6ad04a26d4616cd4c2fe1e428c350/62719995269.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=lewis+dot+structure+nf3
    • 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_off0000c25c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC25C 16792 bytes
font_01_sfnt_off0000da73.bin
88dfab982d8bb5a584e6c82dd88064fb67136f6756ee011a43bedaba27f7b036
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 10576 bytes
font_02_sfnt_off0000f2da.bin
4e4d203750b337f139436997677f821ae3aa5e1f6988a24525634ac9e61a22c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 15420 bytes