Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3d1eb34c5f59c0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 09:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a09b91e3b7c1291a738b9890e4e858e SHA-1: 31cb966073b64f22f7499a1f8449bd8cfe02f016 SHA-256: 5f3d1eb34c5f59c042733ffb6f58b1d9dfb608d9efb6c713930d49e1df0f428a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The embedded URLs are likely intended to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16124ff836e3f1---tasidipevoduzuxipon.pdf In PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b21d06a70---mekusavidosumugatumeb.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c498efa8b03---93176876889.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/45880854525.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/22780876259.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/89155895011.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/53187190345.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/50256324884.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/k5q5r7arp18bcp3hpofm3fvckh/negege.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bdb67303d---rafijupewovuvijenozanoleb.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/kebigofojug.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/64240689270.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/motaluvuzenor.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/977e275cf4f6708726b8266c7a59cb94/48767910345.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa49de74aa8---10970602310.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3aeb42fd9---97201508906.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/kofisomik.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/lizumadizogefupi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cc9a90ca8da8f718c70027b1e045009/satodugubosijirexid.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/tivoleteban.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/zujifap.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b18f22b7dfbd9b8539941cfe00cb7385/4845484264.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/rifowegusitovonozibapus.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/26942807398.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/fd2c3366dcbe45ae75e8ba1246ac7da9/10703221559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=2003+volkswagen+golf+tdi+manualPDF 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_off0000cec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 11256 bytes
SHA-256: 51dfefff14362d9ba1ef880dc4920e16ec4209fb2f4026989776af2cf36c339d
font_02_sfnt_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 17708 bytes
SHA-256: 118e43678062d08a5d58584ef09776f8a8fb5814dadf0f2ed512f901e7b063af