Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e0db6b4c0fcb56…

MALICIOUS

PDF

87.4 KB Created: 2021-07-31 23:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eed9ce9f270090a5776e5ee8f4b7a800 SHA-1: 76539451b73f950db140a69869af52f7c757e5c2 SHA-256: b8e0db6b4c0fcb568ce9c021675850fc8b23887c2a457c851cd425d4c747ea1f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farms pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=present+and+past+tenses+exercises+intermediate+pdf PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lno314g1bimkc0oc12bgjh8f8t/gomuda.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/saviroxa.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce19a9f92d---14609954599.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ec869c7d4e36c01e1c4b5762a2b8421e/80812551994.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/kapofazuverujozutotobidov.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4ss8h8r6c8tqdk4euv7v1j8283/5420574690.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/24710132802.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/edddc131eeed83e02dcc0a0b57ac7862/92360056467.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7afc34930---96084616092.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/3cbe37c925a97b8afccec1e5ee0d888a/bemafupugupamisi.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/sukevitexoluzonumopowi.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3a6d28d4ea2f247d3af335e59a44b19f/8590455256.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/larik.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988168d4b7f---45061474039.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/fawijupapexemepe.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/jaxajizejafewexafi.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a9826a92f---ramopobatedovanunikek.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/34683392882.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a0b81bc875c566003ce693e9d605e1c4/jevorijereta.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9qhpl2qp7obuqhc5d08eock2c2/34795889220.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d0c3d69cc82b323638da7ddcf951b767/74605927970.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/48200855330.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/61892048603.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c0935eb9cfa---68545165153.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 10720 bytes
SHA-256: 4b5e967a39a92d8ed7c1a2c0945a13936c12478bd69e245c5ec5e4802d356fe1
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 19632 bytes
SHA-256: ff63ec96e33154b8993eba10cfa9a5ec73d877edf9633f65daf9e1cb2432ba7a

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