Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e488b117314326…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 13:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83f7becec703e2575699527012e84786 SHA-1: cc15a5708a19c11e9bb4c2679dbad8f59d682432 SHA-256: a3e488b1173143268df20a57228956e9b29a4712e2bd4f63e94dc9fa8e559839
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/vojatojajowogudap.pdf In PDF document text
    • http://posekatzahradu.cz/files/file/dudewilek.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16086c44276cc9---85080683820.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59b38992b---27641118776.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e188a957410---sowanis.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/rizapu.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/lelexer.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/tafuwalijaxuf.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/labifogi.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/zexusamugawizesomozojas.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/jarodopotifufibomem.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/xumajulezepusavu.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/77094989050.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c570881fc40---24555615293.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/97399888412.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/99373672266.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9df56468b41b2d0c36d664378a68cd19/guginobetovoguw.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/rekugefe.pdfIn PDF document text
    • https://rajaunited.com/contents//files/80915346481.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7d0f3fa5---getexekolubulun.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qsb78kpmgp5lgquuf1448kgsm7/54214575014.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b26721b3d3---zejiva.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/3773064798.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/91566175972.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b58619a2583---niridugetevifuforu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dubuque+weather+forecast+15+dayPDF 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_off0000cce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 17160 bytes
SHA-256: dd1709be6841505e86125f4ae7bac9f2da9c8e25d285a87391424ab5d7ac05e1
font_01_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 11104 bytes
SHA-256: bd1ab275f0f8122c66e47bc1f5b5c31c301abeb7ac3d2100bd7f980bfa236083

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