Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8e339b5917501e…

MALICIOUS

PDF

86.5 KB Created: 2021-07-18 00:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4de0d29604805e93600e330f54b676a1 SHA-1: 9efd99253369a85c93a9feebf0ff5c4c07c46038 SHA-256: 0a8e339b5917501e0b298164d7fc9b66546684d3f90aa90059c52848b32bdee4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or spam campaign, evidenced by numerous links pointing to compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or further stages of an attack. No scripts were extracted, but the presence of external links suggests a potential for downloading additional payloads or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1620863487bc343591800407be2aa22c/kubegabivegusuwasux.pdf
    • https://kisikana.hr/userfiles/file/13619941815.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/nbhusbr8n2plct1n7mmqsokm55/lorivuvupemuxu.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160be36cd56447---kunerakotufisobe.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092797c06aa3---sikozowore.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/77322853794.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d884e46da---42648889581.pdf
    • http://sattamatkapatti.com/userfiles/file/10373242940.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c172460519168e644b2adb661b52b2a1/45974076390.pdf
    • https://abugfreemind.com/userfiles/file/83615164534.pdf
    • https://davaocarrental.com/images/file/kesaserifomeduvoseteri.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b73624c0d---malise.pdf
    • http://doo-san.com/userfiles/file/20210521104507.pdf
    • https://doosradashak.in/ci/userfiles/files/78331527396.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608d86a16234f---tojekuxenekogenagak.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90c91109d---23317452245.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e456822ceb---losewojuduripulikuv.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607500efd3f57---talezareguzasopeb.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/36890228602.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc557e11b2---12092041543.pdf
    • http://aps-mes.com/files/file/gajidaraxikubedelux.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/45s4igm7kjjc7km92n0givubl2/zebinanigodelojabalob.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832fec1cabd---83133110629.pdf
    • http://asfcursillo.com/clients/879797/File/32611156115.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d432f8d8d71---tasozejuragidezexeb.pdf
    • http://shinies.ru/img/lib/file/tomozevazujewepig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mean+variance+calculator
    • 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_off0000ede2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 16792 bytes
font_01_sfnt_off000105f9.bin
22634e059d7ab431f76082fc46c25f33923a98947da410d918423c61ae757543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 10216 bytes
font_02_sfnt_off00011cff.bin
bacc2deacd2b3f95cfcc709def3790083781f1eee1cc601be270c6082d9adebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 18772 bytes

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