Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d220579785f6d4…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 22:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d9428055c6e3694aad390e2b0b1d8ec SHA-1: a02add49321110d77c12adfcdd39e1e7bf1acf80 SHA-256: c9d220579785f6d4aa52676661a668aa786cdcbd81a87a295e4e2d66d4895d63
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/7da2b90d75fa716e47d1d256b9f39cbd/82841201268.pdf In PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f075baac---ginifaromuzipozopemiduga.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/650318098a0477719c745e19ae2c91fe/66960970127.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/51256875731.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210828113323_bmVydXJveG9kYWJpem9qZXRpcHVy.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/lowebudapanibigokebisuma.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/fedotikap.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/xuditito.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/85203778318.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/vbu26isk8rutkn6s73re9h0rbb/dulixude.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a304f0930ac---winefilaloxeni.pdfIn PDF document text
    • http://airsoft1.ro/files/file/mivegabemosaxotoxuwixuwa.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a5e417d7ab6536fe8ed231418429d098/47223875592.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/648c3fbebee4f76424d6a41dbe8b3105/fonavajidijelelupumid.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/stlqf0ngcchdln8qma9b7mug24/xulinazapovatogibozogole.pdfIn PDF document text
    • https://purefeeling8.com/data/file/50722863850.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c7626b51b6b38e249d4b6c1907ef7c6/tanupobuvekasanoludi.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/kv23oohcu1s0v101ec4mr2k5v4/18881671587.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/bezefatunigolo.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad9fe8c556---vexoritalelo.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/5350498329.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080697b15dc0---feverosafodedoramatumepe.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ekadei172lrcuhcej9um8ejlo2/57516688354.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/xuziwijarajawavavifi.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19879336548.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/wusafomebukitam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=normalidad+minima+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_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 17032 bytes
SHA-256: 70dd140bce8097bd972887f933a5fb1159b69664250298a7f07fdaa4a7487622
font_01_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 10236 bytes
SHA-256: 7f0a79bdf4226b17f35ffeebabd6676261983bd1107a8149fc98e40f13b2e4f5
font_02_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1