Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ed9fe7345dd158…

MALICIOUS

PDF

85.4 KB Created: 2021-06-26 01:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1649e2fdd9de90c5a015d3972309522a SHA-1: d0d4b5088a0b77a48f85ae9158a124d0c8d68141 SHA-256: c0ed9fe7345dd1584d372aaa5c11204ccb373da5078c2e4f98aa6e4f55fde118
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The presence of multiple embedded URLs and the nature of the heuristics strongly suggest the intent is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://greenplanetnepal.com/userfiles/file/41008743994.pdf
    • http://www.lnk-creation.fr/upload/file/93936751965.pdf
    • http://findusafranchise.com/files/files/33637543756.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1063b0f332ab5ef3ca8ee720168b4ad8/pirabafozad.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tc8b9fmq5gpsst1s10n9qd02pu/89720150249.pdf
    • http://dedanskecasinoer.dk/userfiles/file/62693380191.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e5ae98a21---zolavosikopuzusojatovi.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04aee5fef---5291411892.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160828f04a2615---xomefilojokilekoligixaj.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a90b3e8482f---kixiwodififodudazeniko.pdf
    • https://angelsforwarriors.org/userfiles/files/ziwala.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10bcacae9---zobesenukinavoxalafal.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/mgfk8qend2uh83307t1f6ludha/xibobagevumutoga.pdf
    • http://secohthailand.com/file_media/file_image/file/81220672608.pdf
    • https://partnyor.az/userfiles/file/sitenifeluriguxugiban.pdf
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/d8b46e12c6d7c11989a472167b35ee2b/wulixefufozes.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4635a70dbbc443b42fb072c700e08dee/77425737576.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c8ddcf52d---81253821196.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160839029c6d7f---poxuvaxodekux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=do+you+capitalize+planet+earth
    • 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_off0000ea7b.bin
834b3cb38d33f3ea1ed4da403a35f3b0611fb28323474996f05ce1ac88fd7648
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 10576 bytes
font_01_sfnt_off000102a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 16792 bytes
font_02_sfnt_off00011ab5.bin
bd02f1b57f1ce3daf210a2f95a6addd6c5b79a17add9944779195c15e3c68c02
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 17984 bytes