Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b77f9460326942a…

MALICIOUS

PDF

83.6 KB Created: 2021-06-26 23:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8182020d8e8504ea9acbe4dcf27f69ba SHA-1: 00879da1c6682f3f79ad1a9458901e9554e2888a SHA-256: 0b77f9460326942a02d763043c73b66cfc0639ac4ce3abe52209d5a5042cfd24
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a91335ee854c9d7c92294914dff7da78/3114591468.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc3fce2e5e---29397000384.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/2ho0vn15997t17vkgb1p7k9ndh/daporavesaxek.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/4vsj6l7l4ssbs815sfeb4tp1vd/23821092938.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/b0ars2rj50114qgldfmabtvl73/vosabumegejitofixuzinoguv.pdf
    • http://ligneus.hu/upload/file/fofokutowezekibokezisus.pdf
    • http://apelasyon.com/img/userfiles/files/70893216973.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0c3e2fd81b895c30d3b1828f299e6779/45295702825.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c0387d5e---pojebaxiwa.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ksn65tqimrcr7t4qiavi9qlh0o/vuferofuzixone.pdf
    • https://bakwanudang.com/contents//files/65811076768.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092607f608d7---jebimidu.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a02bb8744a4---zepefazif.pdf
    • http://allamericannursing.com/userfiles/file/37903849325.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/05a906e40fe16fa69c212ed021dd3004/57118717028.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a24595fe7---3465238364.pdf
    • http://antonioruizabogados.es/userfiles/file/3060881592.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f861dff98e29911e8f9af686ef94965a/defatozinadoxuxaxikabarus.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba99156e2d---sevukusanarivak.pdf
    • https://zop.bg/webroot/img/content/files/regesuxekabazisonezara.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e874f41961---fujureg.pdf
    • https://hgb.se/filer/file/nekepebebosejaf.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd501b5d6ed---nejonatuteganuxamomufixam.pdf
    • http://andlupa.com/userfiles/file/jetaguki.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/lopumowizejodum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+does+a+wheel+and+axle+work+as+a+simple+machine
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 16792 bytes
font_01_sfnt_off0000fce7.bin
52f0f05ba2398e48eac62044dfc5f2ebc8c29e4aa53cdda099c753c380b766d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 10952 bytes
font_02_sfnt_off00011611.bin
7adc5a934ca123e7ec25711447912c55601bf41620dcaa25724cd1b2ebd6c114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 16352 bytes

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