Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbe52d6cfc4a8bd…

MALICIOUS

PDF

76.7 KB Created: 2021-05-28 09:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 067c70ac1cf349fe86c72ce32d3e32b4 SHA-1: 7b3f17980ce0b302fee77157e8727a5b6ec1120c SHA-256: 7dbe52d6cfc4a8bddcaa9a9e1ed06c74780ae74dbb2b38efb89c437900b25028
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, references "geometry dash copy hack 2.11 apk", suggesting a lure to download a fake hack, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://ketchas.ru/uplcv?utm_term=geometry+dash+copy+hack+2.11+apk
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7637b91891f1227fbc2d0034b6b44ea8/gedinunamosokilev.pdf
    • http://fedime.org/imagenes/rosuroxedorilemutaniv.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c42f90e58b81f89d9dc4ed7c68f6d306/munerilurigefiluf.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160947585c6f47---buvamanaleki.pdf
    • http://modellszerviz.hu/userfiles/file/magagixavu.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c50e788db0---98793155335.pdf
    • http://lookkorea.net/userfiles/file/83689281077.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609dc9861f874---gofuvafugaserosufuvifupi.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/98132892672.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a34f7bb688d---siruzitoduze.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/79736864324.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ca852f3a---9687749945.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/67df363cc851674dafe98266d3f2a1dc/jikozazakosalo.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/81aae2705c348d0e0e50fc325dfdf8c6/73799557246.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078603cb853c---kejagozaduvalafivasidor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdca.bin
9d071217436e931c6c04d4d44b626073f8c470975860df84a2f5646c2ad7100c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCA 5692 bytes
font_01_sfnt_off0000e10a.bin
bc99ace54c25a7dd36b8ff65d2ff6cbdeee65b358bdc70c7bf96298ff5e8d1fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 1728 bytes
font_02_sfnt_off0000e9a9.bin
d5c2eee9015172712f678e36148c5f588fe4de7cbaa1d1db93a2409bdce8b9fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 10764 bytes
font_03_sfnt_off00010e8b.bin
8f0e4cc40e189f844ba505870c5743bf61ee9cdf6cb8b14e370866b3c0b868e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 16196 bytes