Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a16b687ead45576…

MALICIOUS

PDF

96.7 KB Created: 2021-07-13 21:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 977cc1f6f3c40c8ebc8b98bffa8520ac SHA-1: 8584286f2a91db61925523b547bd5d927cae2f17 SHA-256: 0a16b687ead455763122abcb35642455685d41dcf5cf4a306ff8903b79179b05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The presence of JavaScript and the extensive link farm strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 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://synerhu.ru/uplcv?utm_term=types+of+validity+psychology+a+level
    • http://emailreceptionist.net/userfiles/file/22797079068.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079439006c53---65467304037.pdf
    • https://jxlmedu.com/file/files/20210701_190652.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/5584e27050d3a54e947c272fc9e3a677/56306359301.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/9e36l0su5q3ur70rdo8gllhmfm/65313747020.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081893ae81bb---31369410096.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073474c212d4---76517278567.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/88dd29bae64a91488691849b6893860d/gokoxidev.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727faf615a6---jemusida.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88e75c8a0---xajukutezubawe.pdf
    • https://agrilaui.com/userfiles/file/gaxexiwikaxamo.pdf
    • http://teechart.com/uploads/images/files/58401166447.pdf
    • http://biotop-zamosc.pl/userfiles/file/14947216541.pdf
    • https://whitesal.com/data/images/file/5524_20210713045032.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/24680340126.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ac757738---puvaxiwupininezifemizul.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1656a847f---siwopivipojumorajij.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/dc6ggdp8gi1ojm0g491r6mi413/79180185237.pdf
    • https://banghenails.com/upload/file/tulanikigufifozog.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e209877f1---jutus.pdf
    • http://nenkin-t.com/upload_img/ck/files/pugor.pdf
    • https://uetty.xyz/js/ckfinder/userfiles/files/xelofigonuf.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc586bb3ff---nudebutirugu.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a421022a440---saminubuf.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/i27p40ucoa02prq73iv75jc3fd/36597300229.pdf
    • 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_off000116c7.bin
8f85f6718d5c96fdf4b9f7c559437a9916adcf6190d898885ada83af70b886ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 10840 bytes
font_01_sfnt_off00012fcc.bin
3d16fe3e770a59fc67963d4b2f5c3fc32358610d2337868e41020be9d52061e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCC 17264 bytes
font_02_sfnt_off00015d00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D00 16792 bytes

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