Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2c27d2c0f7203f…

MALICIOUS

PDF

81.5 KB Created: 2021-10-14 23:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4b6b95402302eac74a4350d2b1ee6dba SHA-1: 74c6be66b2f8ee6cd869afd81b944735885f2eb0 SHA-256: cc2c27d2c0f7203f8f15f1e14e8c72f439af790edfe0334078d34b7dce8a1628
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/714684952ecd9457cfa202fc61af3181/68703643505.pdf In PDF document text
    • http://holzbau-napetschnig.at/wirojarova.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/pitaromid.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/nemax.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161574bad45a96---96585654222.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/roxobilixadepijolowoge.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16164f7b1ce03a---mawoxerigijupuzutunad.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/mawumunopibaber.pdfIn PDF document text
    • http://remobudostol.pl/pliki/jogogujonevebevorixus.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/wixaru.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ves28kp610vr3rdlj2it000835/52501976889.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/zopuwapuxopanuvasokuz.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/melakaxuv.pdfIn PDF document text
    • https://equimat-cheval.fr/file/rusexepamimozademapoze.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/10955082511.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/4421565714.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/80995170855.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/30011302271.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/najegapawo.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/15825785818.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16166c87674f1e---berofimal.pdfIn PDF document text
    • https://afayl.com/userfiles/file/74954765218.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/dumasisefufumoduliniwan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=calories+in+2+small+fried+eggsPDF 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_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 10752 bytes
SHA-256: 320271b7453bf9997a17f271969d5cddb82474ada50e153e47f82a115bc2e513
font_01_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 17072 bytes
SHA-256: cbe95669e94d7eb0e289504e93e477a1fa644261e71b8f098cb0c1507cce2eb1
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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