Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b9c44e051e194f…

MALICIOUS

PDF

112.9 KB Created: 2021-06-27 16:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bc24ccb789b817e2e5c78d69424e3cdb SHA-1: cab0b2797d6e8a211c1311a54946ee1a8a61aa9f SHA-256: 09b9c44e051e194f4091be2e55e7cbca9a8268091c00b135704ff7a304f50840
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. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to phishing pages or download further malware. The presence of external URIs and link farm heuristics strongly suggests a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=isotopes+ions+and+atoms+worksheet+answer+key+pdf PDF link annotation
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/gebql7gdt8ej3k8av1aqk7ahu1/30642708832.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/818f3595ef19aa01cca549d0c10eb640/60704953050.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/845ae79cbcbc888b1c047c857955b392/99364941593.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609877af5bc97---kovos.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/zapiposegakanunetuzumudi.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/sobizovodefojizikinudomu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e6f3b65b4d1e12cf01e336a7c2678729/34073511657.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf31d36805---42882777001.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/43911430280.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-5/20210505074704987396.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/q4iggh0gmg8shu9eccjcjig1j7/doxegafesitufemu.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/gefukuvewurififanum.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d801790ffe---sutekuzumaduregawe.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/b0e769869cad0a8ef204b25c51f6c3f6/18215140101.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/447043222f8898a40fa092f703d772f8/sifiwax.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/39499290889.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941efe404de---475800522.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e4e72b9d86170b0876b85467c36e24a5/nesilepetajepevuzoxuxi.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/89121861457.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/93dd60a24efdec897765d5e483d49e58/34122060504.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/kasavoxadijexope.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0dcc0df3f9e1df638ca3ff381402ae81/79129783991.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/64307695949.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001535c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B73 10960 bytes
SHA-256: 85ff66895db4fb8ef730b63843596d36fef617d70d53364e3645586482fda2fc
font_02_sfnt_off000184c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184C0 17972 bytes
SHA-256: 5834ca2478de1a37d97cec973b7ef24446750144283a920c943a12fd51d72dc5

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