Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c9baa452b844b5…

MALICIOUS

PDF

87.5 KB Created: 2021-07-04 22:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dba5e2073d823f414aafa42d2b21b144 SHA-1: 45abeb8d87c3881739dfe900b5bfcf28abd5c8a4 SHA-256: 83c9baa452b844b52463e0d8db9f28f35b0e39e2288135df51f4f9fbae239c97
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, designed to direct users to external URLs. The presence of a link farm on disposable hosting further indicates a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a28f44475eeec0b82c99bbfefdd71d58/48310813604.pdf In PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/b961555c41c7583af6c8c449e7dd0439/defujukuniraxafeniluli.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/53467492942.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612999e7ad---sorerexokudupolinunuti.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/u3dor93amvapj2p7s41vqd3fp6/kabezurubemejozilevob.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609862ffde5a1---dopil.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6c59b806.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/19407655739.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a997c54739386a99c858187c81f3234c/fizonono.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/af4d352990ccae20682963f5d352fc64/rasikolewanewujaruratefi.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a731dbbd0db64c2faa7da819d26466c9/pukurusuni.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/sebojewitefefopovozud.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ac54c6cd5---84615178098.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xajiwenol.pdfIn PDF document text
    • http://midel.me/userfiles/file/sajonenojevotomakulodata.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5d16706b3---66300792.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/moxibojezarafen.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/597d01426bca6853093658e4ece1be59/16588523484.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/bivenibazig.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a23da96d---tukesadades.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b26412104f4---katotagidi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adde94d30dc---91356058134.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/lajafase.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/veziromosazedomap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=snow+power+plow+costPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001096a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 10272 bytes
SHA-256: e7c5caa9179b1e44e51fb3e225aa5c3c358d9c6a93c8b5b35ba1c358aaf6a8c3
font_02_sfnt_off000120b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 18156 bytes
SHA-256: 41c95f2d9bab7eb59c6022289e21258d901a6fe1d242e9617ab57a1b5e4b4b31