Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce98315625a7b189…

MALICIOUS

PDF

89.5 KB Created: 2021-07-01 21:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 362f2ca226c87d6b4087e20cde04365a SHA-1: 96e019c50f51acb3e68e9349a6e4d0681c18dda9 SHA-256: ce98315625a7b189bd0da25b94a815e1a5e40693baaeee38ae92254ddc3b7204
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure victims to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://chcial.ru/uplcv?utm_term=statistical+treatment+of+data+for+quantitative+research+example
    • http://elsekmont.eu/userfiles/file/24028448458.pdf
    • https://keluargamimpi.com/contents//files/37547780753.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9bis39sup5o1decjrn5uld25hp/bakafutiduvonefifepip.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d86ea0c217---86329089758.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/90e8639e251fa224f2f6e854d50b6c70/doboduf.pdf
    • https://aawyx.com/sites/default/imageuser/file/kozuwama.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e49636086facd59b905e803da5089001/pezixonapole.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bd2c6ef47---58876787422.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a22f12463a2a95dcd1523165a4a4984e/77711983468.pdf
    • https://verandapattaya.com/userfiles/files/92843237478.pdf
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/ts9ja3vqb9bl9v9r9v38fj1m3t/26375077752.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wemedagutewo.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/c74b8abb4cc39bd5f9bbb02f9724ded5/dirapomirugamukola.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ba7618c74---31077789840.pdf
    • https://siroyensao.com/upload/files/samebigugewuligopa.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/84721da8ebd37cb48b435fcbf9724003/pamufozugibijux.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b2ae3582---57457299045.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8928eb11---nifozukalefegunekotovora.pdf
    • http://ty-universe.com/image/files/20210605_223652.pdf
    • https://alteanetworks.fr/img/file/33550804257.pdf
    • https://pasarantogel2.com/contents//files/webubuzabolefaleparuvokov.pdf
    • http://topas.lt/userfiles/file/87000930696.pdf
    • http://thefjordbaklawfirm.com/clients/876731/File/gevubebedonisiwifev.pdf
    • http://kursadowicz.pl/Upload/file/tizogeraji.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/074eaf48bd73580d8a89e5b9b32b5a0d/19146629808.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/remidez.pdf
    • 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_off0000f77c.bin
d32873f60442e9fdce62d715dc458f7922a08384d1243a016b218b2a6affd668
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 17452 bytes
font_01_sfnt_off00012570.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 16792 bytes
font_02_sfnt_off00013d87.bin
98db369c09f496a33f0ad7d25daf433198ba9f6e293f84177363ad250740555c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D87 11376 bytes