Malicious PDF — malware analysis report

Static analysis result for SHA-256 e914aa692d742f9a…

MALICIOUS

PDF

98.1 KB Created: 2021-09-08 07:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2fa59e6deab3b5a6106571b6824a51f SHA-1: 221971cdde51bee0f7f5eaebcd2f93e18f79d853 SHA-256: e914aa692d742f9af78b7e0ebe53f2c075f3ddc674f3688408c9a5c40f2b66d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of a download button lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ndt-tl.ru/upload/file/60595809548.pdf In PDF document text
    • http://thuonghieutoancau.vn/uploads/files/rolonujixeravalaxesoju.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071fd12443c0---jetatopunok.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/6491288722.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/turekisuwufejetoxebe.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/18f7ad562acbe9b463df828d69ff3c9f/takexenupexofe.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a296db75---88856568803.pdfIn PDF document text
    • https://avflash.nl/upload/files/mojax.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610836995be2f---palodiwopowisu.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/cfmulmsbkbn31nkos3vnp1ddaf/gabipef.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/n9kglmsh00ankiq90d55bj7bu3/62083373171.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/98712623539.pdfIn PDF document text
    • http://screen.by/images/file/zuginaletabutiv.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/53928639848.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/26783643922.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a482925da1aee56bda93427c6fb5b702/manilugodasewejige.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/28564495192.pdfIn PDF document text
    • http://teplospectr.ru/images/files/4799488097.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160755cd9d60b1---54435219660.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d6889bd426d---36351304313.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/67153293440.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/folomon.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/nitarunafaz.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/c2d42e98207655ac3222749de3a5385d/fiwizebafan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mordaunt+short+mezzo+2+manualPDF 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_off00011980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11980 18884 bytes
SHA-256: e8e1d65d279187a24192f4cfffcceec64c698313d8c18d32df0e6b2389c375d1
font_01_sfnt_off00014a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6D 10692 bytes
SHA-256: f05e7484c286c19de23d432cb784a5da9103405ccc2c6db405671d5b6cf62afa
font_02_sfnt_off000162e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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