Malicious PDF — malware analysis report

Static analysis result for SHA-256 8838ff212b5d2a93…

MALICIOUS

PDF

83.0 KB Created: 2021-07-27 12:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aea125b17af3b0cae2392642f9977ce6 SHA-1: be91e1c38ed334951a137509a55a9342a1928f3a SHA-256: 8838ff212b5d2a9352c911d7debbcfb1584e98f58b89fc0e05ca11f2d95f643f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the embedded URLs are the primary mechanism for delivering a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3c0a326c86166f6532b7725aebc39b9d/wojutarovofiwisetalejet.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ec2ab3d2192f18e5b11e328908374715/43575885553.pdf
    • https://mimpiindah1.com/contents//files/39365574677.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/035db60e436ffff48f8655d99427a8d5/xojijilivobojenul.pdf
    • http://carlaschroyen.com/content_docs/vasejimaxeganom.pdf
    • http://wf515345.tw/CKEdit/upload/files/meratinijakopez.pdf
    • http://status-go.net/gfx/userfiles/files/degutajisibalijevexidi.pdf
    • https://underworldgear.com/upload/users/files/xududarekakabe.pdf
    • https://hmanagement.net/userfiles/file/18231660060.pdf
    • https://villamishkan.com/310renonew/front/images/files/muzigig.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840ff20d17c---7574621232.pdf
    • https://hizlipin.com/calisma2/files/uploads/75232741565.pdf
    • https://agentcctv.com/userfiles/file/xurujowukelovire.pdf
    • http://benefielddarrenfordhicksunited.com/clients/2/21/2186b72972973349411f8b90e6071e14/File/62557021644.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/603bb9646b7e31bbfa01f0cf8ad34e45/fafeta.pdf
    • http://pro-elec.ru/ckfinder/userfiles/files/5160963258.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087203b502f6---32677691809.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddc19cf8b5---53348307163.pdf
    • http://beveragesgs.com/userfiles/file/36093945248.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/067d193a23c95c0cfee5d2e44ed51a7a/74823164220.pdf
    • http://divorce-difficile.fr/userfiles/file/71265540615.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f474d904cae6d71511a0d22d9bf536e5/46449624026.pdf
    • http://nordicaluminium.ru/userfiles/file/26349954461.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/c24cc8fvipad68vk2ae5hrporl/zepapexesenezivogizota.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=clasificaci%C3%B3n+de+los+poligonos+segun+sus+lados+y+angulos
    • 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_off0000de1a.bin
45f4abdd27c51a5b1dddb4cab4117f5b5ca062373783e4ebbc8c890d11896b8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 17148 bytes
font_01_sfnt_off0001099a.bin
d5a7fd9202c03dc9282cc73d0c643644b147b5a254190a872bbf943033cc8674
pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 10980 bytes
font_02_sfnt_off000122bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 16792 bytes