Malicious PDF — malware analysis report

Static analysis result for SHA-256 a839e3557f585f3d…

MALICIOUS

PDF

103.6 KB Created: 2021-06-29 01:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bac0630c09d43ab317d87e4768369162 SHA-1: b42a025c97f8631f49c3716b602112f7d6f99a1c SHA-256: a839e3557f585f3d5790b6ff06958593df8eb565f96955dd0affd763ee489832
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded links suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://acronimocostanzo.com/userfiles/file/38093454372.pdf In PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ut289snlj0ojgjre9svp10g1p9/69188276169.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/suguzorefisodobozunuwo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogiba.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca202d7589---284901882.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/jgu7c2b2evq2stdb30f1556nns/gusod.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/9734164822.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a15027f37---28192229997.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021061406192570554.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073438d2fb9b---69264368636.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/rixizodirat.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/33151065698.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098a21d11e98---tifunadaw.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b6eb23208c2554c87e9ee934333d9a13/58263740616.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c86a33ae7122e05ffa0de1e65d704eec/lukabivewopefatujadipow.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/dunizesuwonolus.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a133a67e51c---89766678317.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e4eb301d---36695664157.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/590sg1927pb2v9c12iet6ng7hi/65274709039.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7db374f6203dffbf72124a644585771d/90160478476.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c4dbd3a4ffa37fb85329951962980504/85120303003.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/35dc5dac80033f5057c6a333137164f6/33027316405.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/pegozobe.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf5b180ee---gitijowizepefoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=block+diagram+reduction+problems+and+solutions+pptPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ff67fcd473bdfea4d0cb38fb3388f9eb/fefilumilivuzam.pdfIn PDF document text
    • 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_off00012fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD0 11244 bytes
SHA-256: d2232a86e682b0d0464535832c1705247750c897f353a20baa95111936481241
font_01_sfnt_off000149ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BA 17300 bytes
SHA-256: bd832c2b6bb2fe8b25bfd5898ab863ce73bdd9e161719fc6eea68b7eb6ff4cdb
font_02_sfnt_off000176f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1