Malicious PDF — malware analysis report

Static analysis result for SHA-256 192b1f79379089f8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 01:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7477e529092598f260008cc598707faf SHA-1: 816f7d71d983330627fc3a009ba7d1c028796a9c SHA-256: 192b1f79379089f8578c100b5b0a13c60dc23de501fe025e7103954ea1d63c2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised or suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content to infer a specific lure.

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://petgears.com/app/webroot/files/file/zibegelikudunu.pdf In PDF document text
    • https://jss-moms.si/upload/File/badunimutexenazedanebejaw.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c751f7a7d5---98684694807.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092da32a0a9d---62363287698.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210703133025.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/loniwekoxekijujuweg.pdfIn PDF document text
    • https://rosycaffe.com/file/16362073576.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab747f486---varivozuwugufugugu.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/lamovazivedefabuj.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2506e1839233191f46e63d2d058a9fc3/76403214918.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/xoxib.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/fedb6cc51253d1378fdfd213496346c4.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/88201627626.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16109589889492---juraxuberugelelox.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/62728720020.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d2e7524aa---98160391768.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/vekol.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cbeb77f7b---jobewu.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/46234831183.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/56171372399.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/klgevioaa244uev9i3s7h3qo90/95462904903.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/perarakop.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/dawobaxuxaliwibozal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=concave+and+convex+polygon+worksheetPDF 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_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 17960 bytes
SHA-256: b1c70de3a9eb3cc303219dafb64ffcd516170c42ba9c18bae36b5e8fc0ef85c3
font_02_sfnt_off00011974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11974 11192 bytes
SHA-256: a2c36980fdfd864df618de9989ab10afe810ba569bad74cfcaaac89fcc998c21

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