Malicious PDF — malware analysis report

Static analysis result for SHA-256 65751cba8a8e8918…

MALICIOUS

PDF

95.0 KB Created: 2021-07-31 23:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97210d148f4187bfc296c146d07331b6 SHA-1: e659f6636cd846e42aa99eb6523cdfd5c3825cce SHA-256: 65751cba8a8e8918df3c0dbc53f4cc62b64a13a109710823e40fdcb15840223d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. ClamAV and ML classifiers flagged this PDF as malicious, specifically a phishing trojan. The heuristics indicate a pattern of SEO-based link farming designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aokman-drive.com/d/files/xotazalubonaw.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cc5cc85b6---jogevudabigegovoreb.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/10427067257.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb43098811---1412180122.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e654242a4---rimatukujejevuvusu.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/zerowaboxirigedaf.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/n60ted5ba8khokhrdkd2qgh62m/46072540342.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/jugageta.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d6a96d2c53d49bad4b301d9faa8e4665/60548079909.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a457ea2ba32---sulukepisipuverutoxexen.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c910dd9b6af---norimef.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160919244db301---fejosew.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/12556780366.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b4f425536606b73bd0dd3848e8e60d58/bewaxevegudosinujejaf.pdfIn PDF document text
    • http://coffee33.ru/archive/file/47372061144.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160baeab479e41---xedalun.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3706c69d99---3261153051.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/e2qh8c10v3hhj72gfvemg5thja/95887441577.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e94ae5e69d---14957408484.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d3024a0207f8e86f0e33dad57ae83ee4/51694026905.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/mitawabugavekagatoladopat.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/898e1035a6a1d0728f3586c906d880ba/31695390456.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/68316237883.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a48c8709---woparenomedexu.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/kuevnfve7fs9h609dfs5vufejp/xelifewabapov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=libro+de+quimica+de+raymond+chang+10+edicion+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 11388 bytes
SHA-256: 62f83e524906a741481a070c60d90ff0956a3539326b6ceff54379b3539d1225
font_02_sfnt_off00012454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off000139cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CC 19348 bytes
SHA-256: 80d72a26051834329c0961e13b89d22b7cd8d46615e8253491842bcd4262b864

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