Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5bc25516170426…

MALICIOUS

PDF

72.5 KB Created: 2021-07-01 20:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f013231286bb9a9d6756505a86622ea9 SHA-1: 0fb34514d51131d3abb9dd968d5b8baf5ce55a0f SHA-256: cd5bc2551617042629b0d92b667f4aa2da0ef34b21e3bffc78dbbd70cd46840b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://aimhc.com/userfiles/file/wuzowekiton.pdf
    • http://himalayanwanderer.com/himalayan/userfiles/files/63955420118.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/92960284329.pdf
    • http://whuntex.ru/userfiles/file/purix.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ducc8ls9s686suhliqcjf4pa45/xevofudejep.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be9df55e477---jegezoduxifogipibot.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/sl71enssedcecavb7nmsppeib6/40303378755.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d052d76a3be---vowopivutefujadej.pdf
    • http://vogiantinhmach.com/media/ftp/file/11635582131.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1642ba2b19---68762064020.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2339c990291931d3c2a83c88c49cf666/16731966321.pdf
    • http://euro-ex.net/images/blog//file/xakekuxivi.pdf
    • https://tckontrola.hr/files/sowemozuxujekat.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ca70008d1b1a912fb3c51fc738b01efc/67132852995.pdf
    • http://avision-italia.com/userfiles/files/4747938185.pdf
    • http://fogathajtohirek.hu/fckfiles/file/velubegetamidijop.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893dd34d7c0---75106254660.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b238ad0224---81247980764.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f5ad6b798e27a10e55cd43cefb0e3b08/rekob.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e13acbee6---27481685570.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/uj2s7tv5gpbdk61ddcomfua0m5/67729379345.pdf
    • http://ottotech.center/userfiles/file/dokito.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2228560c76cec25a6ebaf684997c158e/79300924272.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5746733a7eb273a53182b4797a7f0492/37724533857.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4374f66a0f62507564a222f5cd0d9e06/bekigofovuwikunefa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=in+any+event
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc72.bin
85c3104d4ebfd60ca13cb60d464986ce43e48e855e7dbb7a05008e2f40f8ff0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC72 9704 bytes
font_01_sfnt_off0000d1b8.bin
1375955d773e34812d35ad5f1f4db45de0e12dbf0e95d90bfe4f93ba157c8a0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B8 16232 bytes
font_02_sfnt_off0000fbcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 16792 bytes