Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b4bd586c2d913c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 00:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 630458af348209d96e5df0aec26aea26 SHA-1: 502d9c9ad106212e4510a0ee63d6e8116ba9168b SHA-256: d0b4bd586c2d913ce6aabeff0e7491f651a022be62a0e9a6a846453354a19c2e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of numerous unknown URLs suggests an attempt to distribute or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://amthanhanhsangchinhhang.vn/upload/files/83295239455.pdf In PDF document text
    • http://asude.istanbul/ck_images/files/32374978771.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/77930123101.pdfIn PDF document text
    • https://latework.cz/soubory/mazanininirokikovuzidesut.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/83245680611.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///72505969988.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161041aadd8b01---wekanimerenukagupo.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/vemijiw.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/kemetod.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210731_c3e49.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086f899ebd27---refiz.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/718f433e97b34e05f39de25a81295132/zozoxubate.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fa364f564804f00b9be3ae630ecaea3b/kosagezevitugokomakeguda.pdfIn PDF document text
    • http://unsersohn.com/images/file/banese.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/laburotuliragipo.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/dubikuvekujotonokevotase.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/5bab4b720a9a9fa84fad16410402e1b1/xedofepagutogunaveb.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/25027926403.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c9910a724---56037043951.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/nakekenawonaw.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/1ifoarol1piq6479713rav3dj6/zidase.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/66912837856.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/78138041765.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/vizuzoxekizisazowunutiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=convert+pdf+to+kindle+format+via+emailPDF 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_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 10680 bytes
SHA-256: 666f62977913a05936056a20306a36b7f82e4da11d8b00aca29a05c76ccd138a
font_02_sfnt_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 17400 bytes
SHA-256: e19393091286c91bca2c17f330b80e8e0f8b1ea6e31398f7e36ee20b7b26a19f

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