Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc12ed16aa0f7ce6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-13 22:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 25d80a4beb02ece762bb35280b28eca5 SHA-1: 56eb93943a321f6daab135f3178dba6b159de758 SHA-256: bc12ed16aa0f7ce69900d0ec1cf369e9cd8b0bfd402634ece01586de881716e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=blockman+go+apk+download PDF link annotation
    • http://gwardiajuvenia.pl/zdjecia/fck/file/ledoxi.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/vuvibevobugokekoxufo.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/natifetoro.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/popomunenoruxixulojup.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/gugivisaxaviratag.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ca2117afb07a28fbd71b2828f58651cb/zitiwurubife.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/navavavedeximimusotej.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/wedirimodulibabida.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/vilupepe.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/86407170829.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/69887074700.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/nijomegudibaxenokob.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/18031461048.pdfIn PDF document text
    • http://edallyshop.com/upload/files/70164957532.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/51949641936.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/97930389977.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132309fc55e7---tifomimeponoxovo.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/dufub.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138bab87065f---magamigajup.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/15549638883.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/936e30ff5035fb50f10d475ea0e0c2b7/83797046679.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/gabololodutijagabokepiko.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/91086933576.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/56235641087.pdfIn PDF document text
    • https://amgaa.org/temp/files/bexivunajunurojisuzagif.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/zagupakigelukilevabowa.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0dd537c32---tupam.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_off0000baa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA4 15008 bytes
SHA-256: 1b7a08e81811d437fbf090f8cb471bb6376f40ff1fd9e9dcfea0a489cec33073
font_01_sfnt_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 10500 bytes
SHA-256: a4bba5a05ea4987ef896b9165003d03c57e658f4f64c4978ac5dea6e052a130f
font_02_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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