Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f036ad69c4c624f…

MALICIOUS

PDF

94.9 KB Created: 2021-07-19 08:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: aa43574ef31107d0b47a0007b83059c1 SHA-1: 302fbac4c03f4440a7038cca18102db9d9dbc1a9 SHA-256: 6f036ad69c4c624f475fa6f84ec37214af9344487922ef25a84cd16204665364
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • 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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ca06b17d2---tamolilovumud.pdf In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c277adde3b---53732609666.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ac54d3fe701d2e79bfda79077397636c/belivoxusez.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4c4cdc8e---88739455594.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/11184543831.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e2912215---88526967708.pdfIn PDF document text
    • http://519pf.com/userfiles/files/70199339441.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9e9079ffbcbaa4e84457dd983be055b3/nazukinunekumoziro.pdfIn PDF document text
    • http://aps-mes.com/files/file/25820497493.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c756741c850---89577642677.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/raxigumuni.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/batazuxezefunoni.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8dd273891f458464b065825ee5fe09c9/2915803004.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/97121201081.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab75c05041d---53704570637.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6626cdd69---baxad.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a2f0057acac8ec9c5c47ba4f041965d7/82704834324.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/48719018128.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/24968668726.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/dejewefatipukotaxadoni.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a92699399---levaju.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/87e327d5a14414b6c0ad0699e655d739/11009618263.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/72570444863.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f0ea1faeb0c81c76e5f3be0e67ceab32/wufefavoxozej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+power+of+appearancePDF 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_off000110a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A4 18284 bytes
SHA-256: 0dd3d09ac8f2928412c4c7a6e8ceed6a0389ed2fe35791f964f4385185203187
font_01_sfnt_off00013f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F61 10220 bytes
SHA-256: 8e9d52be417fc4319f31ac1c1ab15d2058e615b43b05b1146cf3b95168a2ffb1
font_02_sfnt_off00015654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1