Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4478018b348e8aa…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 02:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4f2c3fede26eab24cec9e948d8274ae SHA-1: 36412fb395a3183b96da28e09084153b3b63860c SHA-256: f4478018b348e8aa198af34f087b1905ce639bd509d759ab3594f3463c6244f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://crysiq.ru/uplcv?utm_term=how+to+get+phone+numbers+from+android+to+iphone PDF link annotation
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/jixamawusolegubawapam.pdfIn PDF document text
    • https://comfort8889.com/upload/files/72582985224.pdfIn PDF document text
    • https://aneri12.eu/res/file/vofapewubivozajile.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/buzenovupezesonikum.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/levefigitadugexedunuzin.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1c07b81f28d9e7ebb329250591d0ab58/11602881058.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/nopekemikopuxorina.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/sekufevajoxepuwaxop.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/501031882df85cd1471dd23f591c1862/31714868233.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/gaganubaguvav.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8c03e12e---37048192454.pdfIn PDF document text
    • http://eva.am/files/2dd747775e46f277.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/68000592608.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/37659193372.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/medazubip.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/30184249483.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/b4q0m7j1j4ns65jnpv6lebrjhm/19465976764.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/46124893045.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/dusepamo.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/gijaluxotewivawugusemere.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/bekelunifibovomozo.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/35994752385.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/23655397705.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_off0000c687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 17088 bytes
SHA-256: 6da6ca572ae85e45abf155ed632b9e51155bafad8852d8153b76358827b4fbef
font_01_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 11216 bytes
SHA-256: 7bcbf70280d5f38d1d8455178674168a6d938a0a86ed33b40391d4ef3bae8535
font_02_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1