Malicious PDF — malware analysis report

Static analysis result for SHA-256 75df976db07fe606…

MALICIOUS

PDF

74.4 KB Created: 2021-06-16 02:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bdb5939a37267b8a08df59630ef6862 SHA-1: 8dd99eee70ff8bc717c7fb2afafee04f8d3afbc5 SHA-256: 75df976db07fe606af2b6c89491d1a81b68ba25b590a61dec16731a532b652ba
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The primary URL, 'https://synerhu.ru/uplcv?utm_term=download+hacker+pubg+mobile+pc', suggests a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=download+hacker+pubg+mobile+pc
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96b6c79a4---waxagiwitorojufora.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/094f7adcc6d58199c305d0e547143b4f/zegomaxusunodifazaf.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/kadupiwijegubotufodo.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba12122dee---vabom.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609910801bf51---zibeselepizorekes.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a131f48ef24---kazavaxuluparaw.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9177b671d---fexebupaloduzimitogidudob.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e003caf8dd---82530350678.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/3kr06827d2jbi6lm1qcjklh3bk/79921705096.pdf
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/vijubigawe.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81f738903e1ab2ba6f38276d2465ed2f/80669863950.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/bd5f98fce9ff7961752f0ac9653e7da0/lurivirovaxodate.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/qs07nbmqjagnn51l9rm70kk453/72277770042.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8622fd7297---sefinewulesanadifo.pdf
    • http://global-insurance-broker.de/downloads/fizoribati.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/be19fd6b6449409674417f3b2b99b2ea/52889640755.pdf
    • http://shannonlakeestates.org/fck_images/file/9238914565.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e288.bin
987eb2073eeaeb20bd9feaa6fafe9fef5146fe1ada64ab03e1fbdc68ed222bca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 5604 bytes
font_01_sfnt_off0000f580.bin
3592a9a2c7526cd8a42945683667064aaaa2927f2f7d2a3972a614cb2e09acea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 10856 bytes

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