Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ca4ef18c2e946c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 18:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 15bedefb0f0f3106af7596d680697711 SHA-1: 156533e028f45cb914cb744320ffd7ca16c1fdb2 SHA-256: 53ca4ef18c2e946c5da6fa91c01edda8c999a74e98069c2f99a61f9ab57c76f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links pointing to various domains, suggesting it functions as a link farm. The presence of 'utm_term' in one of the URLs indicates a potential phishing or malware distribution campaign aimed at tricking users into clicking malicious links. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=remove+emergency+call+from+lock+screen+lg PDF link annotation
    • https://akconta.com/uploads/files/3866403763.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/wetosunidinasunivawinal.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/9850634038.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/45844481012.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/65665941543.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/687282033.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/kesifelekojisikaker.pdfIn PDF document text
    • http://briztravel.com/upload/files/zazelapexubilililujikadox.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb34b4e4f7---84360444321.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/velorojotujeti.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/suvufexixagoxitij.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/11856714192.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lod3r585u8t3bi1danbf6gb00c/nugujudilobusawaxuputofu.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31624729898.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/32618528646.pdfIn PDF document text
    • http://okun.su/upload/file/turunib.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/93896018360.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/toxuwomibapitujiwinok.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/8lhl3euorn4goob9c0e810afm0/59648291427.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vigimijatolopokobot.pdfIn PDF document text
    • http://fxlcd.com/upload/file/50429896270.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109031230596171.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/14757620825.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 17580 bytes
SHA-256: 77e890e027bcd4f3ec49315da0241bc9c10166ff802fdb9ddb01f5c53c24fd60
font_02_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 10804 bytes
SHA-256: 6ef31c6e05356d1836d75075c8814ed8efb8104081b9c99512fc421ebc6b3490

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