Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8501c1184ca86e4…

MALICIOUS

PDF

82.5 KB Created: 2021-08-18 21:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ca677ccebe88190aa674c2fe8aaa1c3 SHA-1: eacc16852db8ff35ba0c15075dce6175e8339eac SHA-256: c8501c1184ca86e42fb3ba4c74dba3ab2ad48335e7389ac971661e85059233be
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains, a common technique for SEO poisoning or phishing. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs supports this assessment. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607edc0832952---46502616088.pdf In PDF document text
    • http://jlm-kg.com/uploads/file/61659509803.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/13283297322.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/zufomeguxasasugan.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/pisonetedo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9478f763af18bfdb0e4640a15763df14/gabemotivakeg.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/90730174420.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/40879550170.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/52591814676.pdfIn PDF document text
    • http://iccarrentals.com/files/file/solutaluku.pdfIn PDF document text
    • https://hoalavender.net/upload/files/43782078894.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5e708074baad0c90e4e2a233e7fdb0b3/nezanimuzufenujazunegaka.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7382058ef---zovodolifatilosuwofisoguw.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/86183586535.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/katusojupewigi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qd0e464234pr7f8s4mrd6ldhb7/vapoxixugusavefagis.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/28881638961.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/7266206234.pdfIn PDF document text
    • http://bjallstar.com/upload/file/zebezewurin.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/14690620867.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/67060576790.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/fb079cc15e8245b3c7ab29d9146d8471/23146002879.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/ravabusajuxaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+stop+child+support+in+alabamaPDF 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_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 10964 bytes
SHA-256: 958e110494c89f9c79ec083c9921d97ef7916981d40bf1be484b4888a0dd8670
font_02_sfnt_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 17012 bytes
SHA-256: 9398e70b9667b07977106057eaaff5ecb12c44684ba956cb94d3f33212868953