Malicious PDF — malware analysis report

Static analysis result for SHA-256 17895d3b3cbdd1fd…

MALICIOUS

PDF

87.0 KB Created: 2021-07-03 10:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc8455649372b0cccd799500857968dd SHA-1: 9226c1813b8fd95d4c532505db272af5e0c5b0c1 SHA-256: 17895d3b3cbdd1fdf7cf2bc1a85b9f35d534565a68016d2c45d07d591b82cc3e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. Several of these links point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082952c7cb2f---nudugejujurajanikiserif.pdf
    • https://vicotelecom.vn/static/source/images/file/46406526270.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2af1ed2916---gomajexex.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/wifepujigogap.pdf
    • http://bukhatirhomes.com/userfiles/file/41536548748.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3b99b320---75613934786.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/mansstoo93p0dp0c7l7dm4fnuc/nixokow.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/kdc9ors83i612b859rdel2qu81/92692382920.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7b58d3bc---sopoxijin.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/47784327482.pdf
    • http://stacjaregeneracja.pl/userfiles/file/vuvalu.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607824482a16b---47655002729.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793c6498b1a---fifuwilosumobudexiliruk.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cfce1ef99---jesuwidesugofa.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/apcjamcfeen0ahvosv5qbitoi6/goxobatomalerotal.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/el0a3elqma4ucrf049pb3qa3d1/60086702622.pdf
    • https://service-panev.com/userfiles/61670803676.pdf
    • http://designklasse.de/ckfinder/userfiles/files/8945525599.pdf
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/vozomujovopebusitegir.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/dad319504d14a84249cfdea748a8555a/26418368300.pdf
    • https://vieclamxaydung24h.com/upload/files/8335769356.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/07rllul2bea4lugg0a04vhp4p4/judopomawosewi.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11e38cc520---lejuwaposimevapu.pdf
    • http://sapaelitehotel.com/webroot/img/files/xokep.pdf
    • http://divapharma.com/uploaded/file/88684766664.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/0004eff0f3fc3f8cb97068c03e138417/45728878523.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+gift+of+fear+pdf+free+download
    • 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_off0000efcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 16792 bytes
font_01_sfnt_off000107df.bin
30285f99ef1cf87ec547be13c433d503d5097abc6e52eeeefbb6288c39a7a929
pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 17744 bytes
font_02_sfnt_off0001363f.bin
9eb6c259b3eee2c591451d5636c87abec28f5d778b50a9f74d85da6ec3f60088
pdf-font-stream PDF embedded font (sfnt) at offset 0x1363F 10656 bytes