Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d07e0d2216c2573…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 20:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e7ad457f18a546d222b63fd47d29448 SHA-1: 10dd8c94eaec32d31010866e1db85949b9da3a5f SHA-256: 0d07e0d2216c25730d6956e17407348484c120eeecd8bf1787ff4af07c3476e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm structure strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://nguyenthaotech.com/upload/files/95386434706.pdf In PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/xotoliwidasatiwezep.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/1141836816.pdfIn PDF document text
    • https://atiksigorta.com/files/raruvewerodolupupotim.pdfIn PDF document text
    • https://zhansq.cn/upload/file/51007101682.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/55792481661.pdfIn PDF document text
    • https://wsbtitan.com/images/file/92506257985.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebdabc651---dikevobesidikuvisefo.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/22312124775.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324d2ce6264---37150508750.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/fuwenoluxasodolamokujesam.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/65176245565.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/43050098683.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/zetuwi.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/vomeruzisamukizurel.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/kekevapisugizuzamibu.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/61864428410.pdfIn PDF document text
    • https://suruburi.net/mm/file/46746448874.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/09f39051cc6091367d732a480c88ca4d/sejumabuvimixumumegatu.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/51889546608.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/xetatisanasowi.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/38038166849.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/jogazujozili.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/54891897234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=install+new+emojis+androidPDF 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_off0000e7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 18412 bytes
SHA-256: 1549388c8c634191cc3fbd45a4f08e054d28c4f20ad16e4a1dac34fca6cb4ce5
font_01_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 10576 bytes
SHA-256: 65a7f07ad8740b887293d235b49963723e30c2b8aebea0468878fc943c30dfd3
font_02_sfnt_off00012f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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