Malicious PDF — malware analysis report

Static analysis result for SHA-256 627f9725e6c91f8e…

MALICIOUS

PDF

93.2 KB Created: 2021-07-18 16:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 54901b58648b40cbfce8d1f3da4921c0 SHA-1: 4cac4bb387dce75530de76b4b06734f527bb368d SHA-256: 627f9725e6c91f8e1823ab95f607d17a7d2b0709febbeb244d72736f3cae36ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, with heuristics indicating it functions as a link farm. Several URLs point to compromised WordPress sites, suggesting an attempt to lure users into downloading further malicious content or visiting phishing pages. The presence of a 'Download Now' lure reinforces this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f6fd2ffda---dugilagukomiruvukusawe.pdf In PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/24660092047.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3b005b3bd3be0cda3e14ee6c779b99a8/wenuzademisuligevok.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/67s15isf2sieq9it074buhf796/nodokivojefulejuxebe.pdfIn PDF document text
    • https://yuss.it/file/77478512907.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8571d8a478---kurojamebaxifu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607433e9c06a8---45274012100.pdfIn PDF document text
    • http://51www.org/uploadfile/file/69966004bfd259fc13badf4eb23de20a.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c715a16fd07---fotejanimobidutuv.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/60134302585.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd2dd0f358---2836103794.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/dixuluga.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc00c96fd3---16169985139.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/58398e7ad62bcbe3216c26d2f3bef466/nuzevojamodexe.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/soxemoro.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/pubesawomaxalituveni.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7243d5cbb198ad31c1483ce649b4112c/47486217483.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f02b318968e02ec3eeb62bb1e88a43ea/lepunosaditufeder.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/77564889626.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ef9dd42dd---39941658335.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/kanukudenevimanijuga.pdfIn PDF document text
    • http://clingac.com/d/files/77223019108.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/46f6200e83ce3cac95643b764a803157/7544658777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=neet+2019+solved+paper+pdfPDF 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_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 10800 bytes
SHA-256: cb7a42254847fc6a1ca33db1ceeb8026bcfc7e0ca56d5ea3317a5821ed71e401
font_02_sfnt_off00013aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAB 17308 bytes
SHA-256: 8bde5de1b14bb867bc81d4e557439a2cc3fa107187391316e0d8b7bb868018f4

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