Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fb8fabbaf2a159…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 10:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23390105f7b2ddecf5efffd86f9d2246 SHA-1: b75e523efa59c243689bc14f5f417c4eef53b3c9 SHA-256: 78fb8fabbaf2a15906310dd61de9cd4cc104f64fa4961bf45f49c15abf3abb26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The embedded JavaScript and the heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicate an attempt to redirect users to external sites, likely for malicious purposes such as phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=garena+free+fire+lite+apk+download PDF link annotation
    • http://shipsupply.ru/userfiles/files/xikemade.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/64805344366.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/suvavudimakigo.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/ponup.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/sowanemekuxozexam.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132306fbb38c---27017245010.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bosewe.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/14048451274.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/41204907251.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/59255508312.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/67919137487.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/zajowawigipadunumokokijel.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eda4c17dc---9931459340.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/53622123807.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/xusosu.pdfIn PDF document text
    • http://atya.eu/files/file/68937516606.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/66981024406.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/menilobesag.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46393941764.pdfIn PDF document text
    • http://katachizu.com/img/news/files/61227674225.pdfIn PDF document text
    • http://entrackintl.com/uploads/5241115503.pdfIn PDF document text
    • https://satesayap.com/contents/files/xilib.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/nomotuligatazazabosib.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb8b8422f5---32730617842.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/wemonol.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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 18336 bytes
SHA-256: d16d2e34722fd18ee7be14beafa3867f46ceb8056f376f386c1c4c80c4b7b8a5
font_01_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 10540 bytes
SHA-256: 82da1dcac671c2f93db7d0343ef696146e370dc77cdbf1294585567d6d622458

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