Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d2764d181bd064…

MALICIOUS

PDF

91.6 KB Created: 2021-07-09 06:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 04dcc67aa1e859fcbe745796254dd329 SHA-1: 7533b954881ecadabaa3c7bd6b142eddd7928304 SHA-256: 89d2764d181bd0644376e463b446510ab77a1319ea8c8b7257a4c504304ddf4b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://valeneighbors.com/userimages/diruzubobitexaxumu.pdf In PDF document text
    • http://sl-light.ru/design/img/upload/file/wuwiruwinefibejog.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eaad1e227---67707697908.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/48498542715.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/23268079151.pdfIn PDF document text
    • http://yanartextil.com/firma/files/15750079466.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0e7aa4687ff3eabfa4d4b4420f88d45f/54304818759.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/595099046.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/fb90e9a08cb2981d3f9eafad2714cd70/sorutipizosaletukape.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607656fbc6563---woxubevomexifunave.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828e60e0057---84655890786.pdfIn PDF document text
    • http://podushka.by/files/files/21955790852.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/54705e1f179e91066dcd9939f8c37108/zominoresoluta.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/11594445191.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/7f1f3272671657556017cd97e8c63ae5/sepenafosa.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/oojcc3tlmlvt7347bmhn85r2m2/salewaluw.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160882fddbcbde---roguzaxawulizanajap.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/89831132940.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/rekixuxi.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ce1cc18604bb791786bd2186b2f3f752/61820626965.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/968ef647003ea161b20a40fce960c2a3/wizoraximefilutodib.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/772ee21481f82b962c791c87728b8e19/lusidukijagisodavejusaje.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748791dbaf6---39709855577.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/4b40e24b03663d8fdac6f91206b23bd5/zopanuduxak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=axis+of+reflectional+symmetryPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/vewajirotu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 18220 bytes
SHA-256: 7a0ade50ae71c37e61d1524feba80b86ff931328a8332f1fa785e04b952c693b
font_02_sfnt_off0001329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329C 10692 bytes
SHA-256: f6f0514e6b70e24c285c2e38866c56b0fe8cfabd2367840ec57907cd79c7d605
font_03_sfnt_off00014b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B32 16112 bytes
SHA-256: 6c8952d211fe43717d1a6d9ff89f86623c95d7ea41717a5de2cb41fb9036af0d