Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2884b63af4c2e5…

MALICIOUS

PDF

80.1 KB Created: 2021-08-30 18:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 59e6646b2dddd7dcd0a0a984ff2fb2da SHA-1: 8b525d9731fb13f0a19719033a06bee1e2bcbff9 SHA-256: 8c2884b63af4c2e55894e35d5c7c5cdd76740f55eaf09481d8009a7b6007a85b
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=brothers+printer+drivers PDF link annotation
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/zaxanafifumugukuj.pdfIn PDF document text
    • http://blatt-gruen.ch/files/96048707558.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/bf58f9ff54faf5ce7f3b304f4f51b653/33575204198.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/dosozadanalojumedudazu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607996c96860d---82239099770.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/ur8p0suck8pbkdq1i40s2k1ui0/sepelajibosetuzenaxudak.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/zibaz.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/242aae558d972bbdbbcc357e92b3a2ac/sevogumalapiterezexo.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/34697624136.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/56293554573.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfac8b0883---kajosepetekoneg.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/49e1033c39f3e8a72a9ab8de36a1ea31/80707836444.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/kujeluduvokotudasulo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4b8cc74e3dfefddcf8d2f21c1829f4ba/22677511856.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/2urq8isqbv8rve45b3l7f3af1i/tijomopu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/66ede2130770e09387ebf37c42b16318/nejotalegogibexevapuwibil.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3aa06b9090452e2f30aae2f25efa24bb/genozagasu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e745b8bba---68481110211.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/862e12d1ad5f3dc842da43c901df3f1b/41806162934.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/tameferuxepiz.pdfIn PDF document text
    • http://www.moyekolodin.com/files/72308502715.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa18b865ad---94460227588.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5e0fedd95---nedatofixuribofopujo.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/29152202673.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160774e5484dfe---lemeziruwidivopu.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_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 16892 bytes
SHA-256: 7dcf7f89f10d88a9002d16b275e14891146a834d2f13c66306052fbc33f7dc2f
font_01_sfnt_off0001030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 10400 bytes
SHA-256: 7579485baa46fdd4d069523b85f21a9d637b36bf3f842533e5fd8ab1ca5f31f5
font_02_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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