Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7378a42d7e07c4f…

MALICIOUS

PDF

75.0 KB Created: 2021-06-27 17:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 39a7757bccf8e752fa33797ebd69ff33 SHA-1: 69e2cad390b8c1c3932e90404c5706c3c87c1d3c SHA-256: a7378a42d7e07c4f7860c23c1f05b3b02dceabfec0b374faf68970cd18e57cfe
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a phishing or malware distribution scheme where users are lured to click on links that lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088176abce71---pavowududepafu.pdf In PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/783f30f0fa39d9476e9a45d815bd91ee/39256237616.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/pekojogogas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b818788f11e---30918998516.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/1b88isdmelm9k4ndfnra95svfq/kuwezukifalawinuj.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/42215817066.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f6298fbc8---16009727883.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/gekogaxomoroturomawi.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/vamolifikowowuto.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/86826305994.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507110544359129.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608356ea3a14a---1494990023.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/kkbbev7lot6r7p5c21kl7bv5p5/49081922982.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8d2478afd---tatofazukefemusipiju.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082a23037b23---kolulunelawesegomole.pdfIn PDF document text
    • https://bursac.net/userfiles/file/rizemikovekevufivakod.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6fdce18e---91571035245.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f8936073f---pupefagigowonodila.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/96141123c9ec735c040b44a2cc5f8dd1/21974027843.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/tepadetijolerelijapaduw.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8dbba1316fe39c3c50ba51d705c342ee/25411199703.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d7e6631205cf9e6e96ddc03572d16510/lozeduxiranefofavi.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/dekiniloxutudiw.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/95915738442.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e88868d69891c39d258d53434e3437cf/tovuduvaporitoferizen.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609106281d0d3---jaxinijisisixorarixo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a335a0fa97---84932443424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=submit+pdf+form+to+emailPDF 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_off0000c2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 10704 bytes
SHA-256: 2be6de75b42002111652cbd0b6874ffa922f8d7d7cda807b8186005e2ab170b3
font_02_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 16692 bytes
SHA-256: 207264080467767acb35490229811e96b967623f13e4ca5fb05ab980d229d8bd

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