Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6f5598dc9ef7ce…

MALICIOUS

PDF

94.8 KB Created: 2021-07-29 21:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b679a24954a1e77aeb3321671677273e SHA-1: faac213d33899463072124848394736bf20cf541 SHA-256: 3a6f5598dc9ef7ce51d352358e107506823e8777dfd71f863ff10d787baff660
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the links and the PDF structure indicate a likely intent to redirect users to malicious content, possibly via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff16c5c4ef---lijepivojeno.pdf In PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/palepa.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f6591834b4f---genabenizuvewuvotaxulib.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/3271235110.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/12848638124.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef3382709---kijiderejomarebuma.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/59f5045f04c7e64263847e8c2474e789/45612759022.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/8522998935.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3498986441e94916e2b15cb6ec4a4a80/95146527355.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/zesokurejaje.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c327a01be---59646098806.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160993a119c0fd---79207453288.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/bafexakimanigev.pdfIn PDF document text
    • https://anfauglir.com/images/file/53104197530.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/24305609715.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/14956725425.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/41b0b5296286f896eff25184545992f5/68263183624.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da2c4da1750---pedigovezag.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/marazebosefewemuz.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/texuwofag.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/sinonuxonawatukimarenoxes.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/vuzamirekukosupozekejoni.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926fc818e49---62443850400.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/vakedevapob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bac+blanc+maths+terminale+es+corrig%C3%A9PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 20608 bytes
SHA-256: 765a6798db9211f240bd20f6171dffa88323b6a7290f844c0b675f38097ac120
font_01_sfnt_off00012421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C32 16156 bytes
SHA-256: be11e3e52177c4214597f653c063ec46c1aaa27361ba094db0e7ef3018a8e354
font_03_sfnt_off000151b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B9 11024 bytes
SHA-256: 35712a19058e9841176f5d7f256101db72b5488183db4012e8d3e425df1ebbb1

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