Malicious PDF — malware analysis report

Static analysis result for SHA-256 583634852fc5ce64…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 12:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba86a8e186aae7b497cc33362c8c3672 SHA-1: eb714f27b4b1f552a918c2f461cf9f6d0d79f45b SHA-256: 583634852fc5ce64581506c43fc63a479260f2437200ff7ce3da4edd7a71d550
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious domains. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://herningbadintra.dk/app/webroot/upload/files/zusexopi.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad828c9585---5445552684.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1d38d9c1---79507937134.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/38856984959.pdfIn PDF document text
    • http://agrion.org/upload/fichier/58688968168.pdfIn PDF document text
    • http://chicopharm.com/upload/files/48320384077.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/bowuruwakanuxeputuki.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/vivuf.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/34489917f81e8cb51784f5991b6fb961/26986730121.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/33686183558.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/47404883848.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/91233569889.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3e3446cbb57f88727c3f2765fd9e6d40/79939607166.pdfIn PDF document text
    • http://ropesadventure.com/d/files/sajopuwosoxerivud.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997b9538ddc---dupomovujediponiz.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/zeredejosusupapawi.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/peponujilezitutasake.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a5365979f---gafezinedubusag.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/67591047967.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/ligetumunux.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/giwoninuvedatulisufisanug.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/10717328161.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/dereporelapidik.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/genitebe.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/towoxuruxawix.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/68420662723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=trygonometria+zadania+matura+pdfPDF 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_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 10864 bytes
SHA-256: e52daf520aa2f98e62f3c0b44c2070716cb3de3ebe80b28dbc2d9e29df4c5c49
font_02_sfnt_off00010c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 20756 bytes
SHA-256: 3b728c86c1f624f7a52bf9c37750bd6fee7e0abab140611c685a74d33ac424c6

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