Malicious PDF — malware analysis report

Static analysis result for SHA-256 49adbc658dd69e05…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 16:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b5c832ace12124e76aceae8be882cc3 SHA-1: f47e854b78c2fa39f3a8cf5965d3b3cbb3e73292 SHA-256: 49adbc658dd69e055e6397e12b4509da271d5e77fdc5e31628ea50e050bc3e2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of PDF link farms and the overall detection profile strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://wastran.ru/uplcv?utm_term=logit+regression+analysis+pdf PDF link annotation
    • https://oversaslogistica.it/file/zuwozoxog.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/80914486340.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/07ef2b4d5b4007f2dab45cd52447f8aa/57174723019.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/lulatat.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/dexijeralo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/250b60d5aa3c15072c16c3411b517a60/21148489121.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5ad2f86a449ce995599b7a6fc6cbf0b2/jesavabavanizitajabisowe.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/kebosifatotarexupufup.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e35e144a4---lesedonilajifuwodibugele.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/fdce26e141371d367d31232a4b2f8d94/fejaborasawubo.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/53f147cab333359b7a37b97b2870e7ee/20009089192.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/dd58f2f2f7e6ad034dd62ebae5347366/vivugijake.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a88ce2a5c038e90c365d0d46cbc30b72/lifobuba.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705a405d342---85096400694.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/jixurenomanopexikevuf.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/49481617269.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/detoxoromide.pdfIn PDF document text
    • https://soechi.id/userfiles/file/sifulam.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/65979434443.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/tirebezikomoso.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fc4942350c3952d89db9f1e0c8f9f61a/junorobebofuwapalavekufi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e070d65d8d---17531097949.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7e472192---minugijalapewefodadito.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160811106030f4---vadogo.pdfIn PDF document text
    • https://seerupit.dk/assens/file/67565810719.pdfIn PDF document text
    • https://sambelteri.com/contents//files/59477995551.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vovatosuzokuvoxuluvotol.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_off0000c117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 16556 bytes
SHA-256: 5843185f8ec7e305138ed44a82bb52831c5ac42f6cca83a359b92e1838cb1665
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 10744 bytes
SHA-256: 99c2b2cbca0deb20190a74f62baaac4c9e46826e4cc24ca9b47b81459914af07
font_02_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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