Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b2ada0c7bcd1b7…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 08:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e3d0f0a813eb69cfc0a64bf4953e8fc SHA-1: 7b9ef29f610c6ffa075d96eb9b03195aae7a5177 SHA-256: a9b2ada0c7bcd1b7603113242e8ffb37186ed59de9bf7236a24892566ebdc672
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://yeditepegumruk.com/userfiles/16173641357.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9441a8c127---59549445808.pdfIn PDF document text
    • https://people11people.gr/uploads/File/latotetatizirozopive.pdfIn PDF document text
    • https://termoformat.md/img/files/xuvoxofedibalakesazub.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/vilafagowuwesekazizuv.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b17eca472---33138056630.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/1c6efd41c07cc78b722ba78f28363b7f/pelobuxe.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/jojudizenekis.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/4o80vg96m1lhv2qccr0efs6k36/mufizopanopa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/desuran.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079bbfe0cbbb---84345119682.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160704447f1b42---42653507786.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ded815678---93352429409.pdfIn PDF document text
    • https://alutat.com/data/file/2780640485.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/vorizizetope.pdfIn PDF document text
    • http://robedecreateur.com/img/files/bixutixexe.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/0afe1c1dm6kn2c27v57lkf8mti/73644613068.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8990a8aa08---99454730402.pdfIn PDF document text
    • http://moristas.com/userfiles/files/63146547738.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/48536058192.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/6285007074.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b69e01ba---nuwibepuvidezoro.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/93073306881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=by+the+end+of+grammarPDF 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_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 10660 bytes
SHA-256: 585ab60ed621a4084aa7e88843ead74e31e37973b3852d8bdc9f6a0f4ffb300d
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 18276 bytes
SHA-256: a16df768d869f840e860ec37056f7a377cd350cc1bf8c0712408b00126df261b
font_02_sfnt_off00013585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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