Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb68c057fd843ca2…

MALICIOUS

PDF

83.7 KB Created: 2021-07-19 07:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0098c4088d1c4c987a4aaf4550579276 SHA-1: 24ee3aeb9a4e7c4c5b120738dc403af3ac154a06 SHA-256: cb68c057fd843ca2a1fd21d930a442a195a549662d1fce7315e1949a8575c65b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to phishing sites or malware downloads. The presence of multiple external URIs and link farm characteristics strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/dc1c53d48791fa1693a2caeb86dcfd8a/wuxezizisiwel.pdf In PDF document text
    • https://magatek.com/documents/file/31677652272.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210529_A10AA49D0884DDCE.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/pigonovufusejonosubowus.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3f1e031cd24e6e765e53a98739f20911/getalod.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/edbbcb98f3505994fc31f670efb85961/19008492214.pdfIn PDF document text
    • https://edusfera.pl/upload/file/49461770823.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cc5e7884140edd98ad0c09dedec1003e/84809040607.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/54377808484.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/48420745bc2e5475d0b92864e63ad482/loganaxijenedigota.pdfIn PDF document text
    • https://chp-travel.ir/data/file/80355289221.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609abcddda9f6---98900995917.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748691da40b---tuzevisudoladesamozu.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/faxixadimomu.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/finixinupisuvu.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/nanunakuxalaxemowesibo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160866990ce302---wenufitakusesuworoj.pdfIn PDF document text
    • https://faceless.me/userfiles/files/kozegozowu.pdfIn PDF document text
    • http://jarosi.hu/files/file/77927048204.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b61887042e6248400c51325b9d34e844/71393948929.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e142a862a5e460f704fb182e5f89c1dd/64705739443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=free+fall+motion+experimentPDF 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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10428 bytes
SHA-256: e7af8cb63ea7dee362c068ea31a6e5bbb0df9c797602c11dcd66d5b29c71d9f5
font_01_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 18036 bytes
SHA-256: 0eee4421f93c14e55c5becdbefb66dbf02e546f03b64c1f0cbd7a82005bc131c
font_02_sfnt_off000129b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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