Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a3451681af811b…

MALICIOUS

PDF

94.3 KB Created: 2021-07-05 09:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b29eea5c8edbf22cf9ce52c516d251db SHA-1: 81f360e22061aa59e11d75108512b31f45868925 SHA-256: 25a3451681af811b3266dcd7705440fdff02141a503f4e83e926a35c3b031603
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://synerhu.ru/uplcv?utm_term=boxes+and+sketches+class+5+pdf PDF link annotation
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072837222d63---wexupufit.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/313f4f80a8f6eb864d45e5e98230c659/bumifeberorigibefinidib.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/91454131464.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2rqvqsiicman9n4h7ao717d1o2/relewuripipafugivobigagin.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc7c726529---fofenadadof.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716a1347079---mudijerisogenet.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160953aae8534e---midaguri.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e6a7f09e1---20436038999.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e0298b147df328a10d1f815d17f851f1/moloxotas.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b003501085b520758e24ad417c7c73fd/32505838008.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/b0adapcr44oivarpj94j65mi73/gakifoduzobolilafoma.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/dd8341075a4e6f45261e9d2a574e2581/toxasozalureza.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6e708609191840d556f80947a8ae4134/50638960392.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608560301c746---94247338887.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/25773515520.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1a2b77e19fefdb7bf51b9671338a1af/55774097739.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/3538781bb5625c2bae97f499e8f47e91/minije.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/godelogilobadepa.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f11cd5c509979881422efb4a8a7a9ff2/32754996523.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/9994279442.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b2229f4b3---34948451408.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/e67e9d17497ce6671eff7fc21f6d71f8/nudirapupu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2b99446a9---jelesaloveboruru.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9679524a9---60268522449.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/80314012253.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 10908 bytes
SHA-256: 7ec2a0f826a3bb6cdea1f340e55fe559cf4fe03f8caa340c389e2e75ae9d72e3
font_01_sfnt_off0001089c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 17120 bytes
SHA-256: 5197c4e1a78273d417f03e87f0842f528eecdb77a385fec9299989d375349c97
font_03_sfnt_off00014da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA3 17960 bytes
SHA-256: 62dff1856bf66118f515ae113cc85753b9172aa3244c7e9f7b897197e17d0adf

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