Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab982d09f7ba08c8…

MALICIOUS

PDF

78.0 KB Created: 2021-06-26 12:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adaf2b14aa66043f93d3110755ab8f9a SHA-1: 1a9f630d67500f14032d4922270122e687e7336e SHA-256: ab982d09f7ba08c84f5a1629af206c7131c7165c02ab4e25c03f3a6939c54a6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure, with many URLs pointing to compromised CMS uploads, suggesting a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc3842876---9844234322.pdf
    • http://funperm.ru/content/file/jebajodozikusupipifasuzag.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4d0aaccf4eab9254e21676cd29e2a3e8/20867168544.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078107727621---47312287691.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b1155b75---tuponekaze.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vt2e6fvsfj8pvqs214porscq1j/gevomig.pdf
    • https://susta.vn/userfiles/file/fikujepojijax.pdf
    • https://panificioilcavaliere.it/userfiles/files/86812753787.pdf
    • http://mevlanaasm.com/resimler/files/43749834652.pdf
    • https://novahealthclinic.ca/userfiles/file/40129494786.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/mijiduvofedufed.pdf
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/2400132491.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801207e236b---7084232279.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a939640cbd3b94abf2806e1fd4b73751/visetenavil.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768980c3ad7---66113595840.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fc581be8cb9f97b41248cd737c155ebf/fixub.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/bb9997c5c8a3cf3c5365af13ef89654f/49764554815.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/i2bckgi5p0518033c130sppl83/5968665649.pdf
    • http://the100voicesofgospel.de/fichiers/newsletter/file/lupufidefusexilewazijo.pdf
    • http://starcity-vinhomes.vn/app/webroot/img/files/8039886473.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/696e0a067f02b7f8c9eefd57f1a52f58/95588145735.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hearth+and+fireplace+near+me
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d00c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD00C 16792 bytes
font_01_sfnt_off0000e823.bin
aa568338b8ec10628f9f8bcde22c5e143c86dcde3ede0f53f63788500b2374ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 10588 bytes
font_02_sfnt_off0000fffb.bin
bc917c5f7291413c065c84a1623b534b397f4dc8ea6606ac343c69aa993a1625
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 16512 bytes