Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad7152611792297…

MALICIOUS

PDF

83.0 KB Created: 2021-08-23 15:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 658edb42944331a9941c0083d50747a1 SHA-1: 7fa5422e9139c84744fd7a090f01b35b7971e8c5 SHA-256: 8ad71526117922972c1f8e1fb5ff028c96b05ab18ff83232da96f14591161048
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to external malicious sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=deaf+mute+means PDF link annotation
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c80bda069---86384195866.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/29316976896.pdfIn PDF document text
    • https://digireg.cn/upload/84660533327.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757928af477---visusimenutikuput.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/rojewuduwulowonosaru.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/82568953852.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0u5jtj4mf4rga70sav0ahls42/jugoxaketivodi.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/toxamafivagatebobidupofol.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/9gkvaf0f8g46jljd3f4hhbgprc/30584843569.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9ab4e2368---78550641860.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/u7oesqpe4n11s9934u8cfe33oi/33121121090.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/84417032065.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/44201365742.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/14850669705.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/8062424027.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/mizup.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/zoxam.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804dbf5926b---70330839094.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/58160844081.pdfIn PDF document text
    • http://keitbg.com/images/files/xirokivuvex.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210710091418_swp5s5.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/29361348756.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/77792691843.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909fa933ad1---xopiwidu.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_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 10116 bytes
SHA-256: d813d469faa1a5757c7c3796aefda2a53ac48d2fdda507ca6918d5fb9c2b3830
font_02_sfnt_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 17324 bytes
SHA-256: 27b562af0d3b557c0560a569d6894f769d209656dfa64990669584c417ae93e0

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