Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69c72fe3172503a…

MALICIOUS

PDF

91.5 KB Created: 2021-06-28 00:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17ed6f61585be62ed2df87b5ae4e474b SHA-1: bf7b96df0cc5d85747106f91d7b01151174ac584 SHA-256: a69c72fe3172503ab9f61d5122d67fdc9dd86436c92a14eedae7eb59af676de3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a54bf998---purisu.pdf
    • https://pristineleather.com/userfiles/file/zagenesofofu.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/vugelitirevawemebab.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb021652a---kaxawarekodizi.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/963vqaegvn45u7cd3r1tdfk01j/51229047819.pdf
    • http://www.kammerpop.de/files/file/kozuzuduxadevorulisajen.pdf
    • http://bielwod.com/userfiles/file/1010445920.pdf
    • https://dursunguney.com/userfiles/files/gixutatijebo.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8e69e428---5464715648.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ojr9as1n4208kg2kn15stpnbpm/82235630292.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/aae62593f282fd7b8c3f043fa5df7138/5460822393.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecf9ba7a9b---dobolozotugonuruli.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/51d54ee91e5be2b252665e2bd87c182f/badesegudusafuwinufararu.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/a5e9mdomnlmcdefiok5c6dgd81/85976233669.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2ccf3fb7b---5362239435.pdf
    • http://aranykoronakft.hu/userfiles/file/zeraloriburigusazi.pdf
    • http://deurenhanger.nl/userfiles/file/sivumavusapa.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i69aia3orpts9jm43lk4vq5lae/24130900748.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4aeb8125a0e7dc6920eacb9602d3ce99/16636862018.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e565b1a11---79006929996.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a67550299d0---79428021185.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56e425def---pipirusebokorudilule.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c56f486b412---26073643058.pdf
    • https://linhquan-group.com/upload/ck/files/gikatezebimivasudujaro.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ancient+rome+questions+and+answers
    • 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_off000102da.bin
adc7b4a73349156a763899bd5fdb75cc93ac58c73e4c0acf4656b64bd5a00d4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 17264 bytes
font_01_sfnt_off00012fd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD7 16792 bytes
font_02_sfnt_off000147ee.bin
2f0194274e9a4b54d3ae52fe5ca834e87a5fd5a7a0ed720ef9212a3dec228cc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x147EE 10796 bytes