Malicious PDF — malware analysis report

Static analysis result for SHA-256 1487542374d4be59…

MALICIOUS

PDF

71.6 KB Created: 2021-06-20 13:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 82ade66cb4802949f763f07bb7d80606 SHA-1: 71b36cd97aad630f87cc0dd6b480290d93be2ee8 SHA-256: 1487542374d4be59d408dfb5c8a6ee0953629f965520331e5d192b1abb429bbc
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised WordPress sites, designed to trick users into downloading a file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c350b75c5e---10717998486.pdf In PDF document text
    • http://scro.ru/pic/file/rujusiru.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/evtavc71icip1o1vq5i3fvgge1/lalepofotajalugoworomu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b051a494e21---povilazewamav.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/xobigiregopurukixeji.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f3f54fe4a8a5cae7c930a7c5ffc43429/ropamika.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/xazekubara.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab939d08c7f---72155740056.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/labolasutijazavadunoji.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/gozikopiv.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a31df0f2985---11208805620.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/jojavuwotizezidefiki.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c415aef2f5f---54900548156.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c73f157be6f---61183541593.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/8396904210.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/bawurowibifewodorixe.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/65578613961.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097eb328f9e4---79124641171.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sims+4+black+malePDF 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://scripts.sil.org/OFLIn 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_off0000c159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC159 5244 bytes
SHA-256: f53fcbcc3b8ac09fa91e0d08860163c467e831eec74cc6242b1f891cdc1581ee
font_01_sfnt_off0000d328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD328 11392 bytes
SHA-256: a55ddc786ad1f322881cfacf0b3688b0033d4b04a259a658655afb51da716c7f
font_02_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 16404 bytes
SHA-256: 882ff5be9def02ded42d83d74309ee0f16aaf0606961d15fdf0a2ca5854d405a

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