Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bf7e70da659e30…

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 05:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18ae71bfcfcf77d1a5dc4cf08ede4440 SHA-1: c176503b6a68a977c0de0f9317229974364f67d1 SHA-256: a0bf7e70da659e30b83b8eacc2bacd3cf6e3dd5999a163abd37d79c65494ad67
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious content or phishing pages. The presence of multiple links on disposable or compromised hosting suggests an attempt to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd602aecd1---vipujaposax.pdf In PDF document text
    • https://beautyyaurient.com/editor_upload/file/76968842117.pdfIn PDF document text
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/82420362201.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8d887faccdf3c378c3fda784c528a653/22844236102.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7c8bbeacf8d1b237531cf9d2bba90c98/44548178518.pdfIn PDF document text
    • https://synersys.fr/contenu/file/vanasaba.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d9861995d---surazodigarote.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7956e57d1e---40271080304.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad08638fb---23993145693.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/78900127639.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af3d6f549---kibipepuzewamosub.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e76af7ac---kasexekulabok.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dt3ge2sjilmu8a1jj510mke982/73123070670.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/4b86f593uklu572tcr1lj2q7am/xajozibuwivuluvu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29c77b4ae---girovopubuvesugasanav.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/7b4cf3ef5750f25b5195353d393dd085/33845287716.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/sidipisaxidedewamedolola.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a3065eb55---pozebuserefagiravobivot.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/eqsnl5u4k21kl5jhlp1329ccq5/jenofifimuperiruxovizo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d15d88f021d9e4e34f05b32569e6e68f/resebusuzulovizifetasaxa.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082e01551c7e---zugewiwiwoluwuvenonovadun.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/50053269287.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/apano5hdgv64vl49fs0lqocp6s/magujumafeginonejikede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+byrds+tambourine+manPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 17060 bytes
SHA-256: 89dded0bff7f3b79177dac11b7e0df6b5e47e5d4b4d4c1aea1c438b28ed41a67
font_01_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 10784 bytes
SHA-256: 1c12be9a6927e2dae171394510488cf34c0737afbc654b446bd56665ea8e658a
font_02_sfnt_off00012e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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