Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70013c2cd36b9ac…

MALICIOUS

PDF

110.0 KB Created: 2021-06-25 19:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f9670dfbcd695ee5984c9632a030bc34 SHA-1: b79a3f0d51b73a02fc6415b5d4870082b963a35e SHA-256: b70013c2cd36b9ace57ce1ff9f2301030cde0538c410237b9000e296ebb8bca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9eb2d4beb---lefutemopovigetabik.pdf In PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/17537652219.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/igti12v5j889rlru7qj1l9l52i/32046201046.pdfIn PDF document text
    • https://bataretak.com/img/files/file/68960102265.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/4qicqq34emhabc2ck5h4ium0rn/dijun.pdfIn PDF document text
    • http://fields-on-earth.com/34285112931.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/27300396506.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/eqkqstoai1t5maa7hbnaedivm5/wegiwokajokenosaxaxuk.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91510353b---73045115343.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3f506e030177ce592d37eff11ce0a7fb/80897584904.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/38968510579.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7f0b426bc---36268173643.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/57344562154.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/fogukoxe.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc6cc686f---28945622906.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a8e646967---53815972462.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cbcf83bbb---48330544834.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/latepewuxok.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6a07ba30e---xisakuxomajetelu.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/jivadufa.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1561c0334d---65545382917.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160979e21c8025---suxodenigemumijaluvimag.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d637d0eaad6fc6038548c20abc3356ee/89286383044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=easy+to+sell+synonymPDF 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_off00014b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2F 10176 bytes
SHA-256: 30d44f27156c3875bc604af82e093495da28385aac39be20cc4e941f9f722731
font_01_sfnt_off00016201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16201 18072 bytes
SHA-256: 2027953d46f0cbb700f6bb7b2808f9a00f4090c1f32c2209f45d34cabca04a21
font_02_sfnt_off00019154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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