Malicious PDF — malware analysis report

Static analysis result for SHA-256 7085767171f52517…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 08:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27704ceb6e1b9bfc3c67f104a1ee8452 SHA-1: 2f5abe459b8b8df135ed78ddfd0dd4134ffb95c7 SHA-256: 7085767171f52517b15fdcc92bc48a7582ac16b2782f801a505313fe4c83eff1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous PDF_URI and PDF_RANDOM_URL_LINK heuristics points to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=training+completion+certificate+letter PDF link annotation
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/25595763336.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/zuviwufepige.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/97046538759.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/muzuxipe.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109051238426908.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/97724734610.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/lujifizerokumulofilawomab.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/pogokidagotokulofisekaro.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/3211429240.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/11860592374.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fea92cdfe1---85868092977.pdfIn PDF document text
    • https://kawanmto.net/contents/files/vijab.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/lekometiripora.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/nuparabusezorof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402e2bcaf74---33914776832.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/92557754998.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/jawomave.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613932120e4e3---vumigivotigadukalaturuxu.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/15521221690.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/69784472319.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/lezelubifipidafav.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/88833364722.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/najolij.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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 18280 bytes
SHA-256: 7fd35e3f5bb02acc2e2e8a1050a5bb290e1c039369733746e833c7292c58af62
font_02_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 10620 bytes
SHA-256: 0c7d237e1e9329a7ef815e85b54953711990347e041f433cb0b3bd2bfa39f78c

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