Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdde95f7b0b421f5…

MALICIOUS

PDF

80.8 KB Created: 2021-06-27 14:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84e984363c74d99c0de1b991e10fbef2 SHA-1: 52ab0e04c1530b0eabc5b9d07257f464fab183e7 SHA-256: bdde95f7b0b421f509e768817237d4fce0af51358f8810877399b463329521fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, 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 nature of the link farm and the presence of PDF-specific heuristics point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/amdt0h14qhug0al88a2lh94cm2/82096737202.pdf
    • http://sahrugs.com/userfiles/file/jijegubujeba.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b7f600a7b30875dc4e69be521fd81330/65375430572.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/3sftjabur9lf4iqlpvb9q5ptb5/20958366510.pdf
    • http://kistours.hu/userfiles/file/42422593360.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/87bee804d62e5b6c978f2149eb7ce13c/zuxokeratinid.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/45fdb721b7c9180ce90df3234fc50850/fenesurixavagupi.pdf
    • http://allmedicus.com/userfiles/file/22171074022.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/671afb0c7d91f6bb56e9a11eaa47340e/ridotixesajesamapuleb.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6dd13f9898409d64444d5f290caa5210/zuzami.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/aaa6a4e5438fb5b8528a49af47748a5b/89235537295.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606f520ec9a70---15063155094.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/sawefulevalakewufemoduru.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b91622b6859---80047123516.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1g11ifh9gin28dtjalevf8htv4/42003422512.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/ac5d6fed4d5bad2eef78271a0665cdbe/jatarojijarapukigigo.pdf
    • http://jgbt.us/pds/userfiles/files/renezanafanenu.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d68708f39fb25953ccc6083c766978c8/lozaxemesimoredafafatadu.pdf
    • https://bawwabatrizq.com/userfiles/file/8575096673.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2437aa1cab---giforig.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609119fb7a94a---jukawuwitudoxalefudo.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dd302f2482405bf39b505e5da929ed94/78226039803.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/c30586g9rqgk0rj1dbiiib5fs8/47280117689.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/62d579413cdc4d341588da08be3194a0/sigopoto.pdf
    • https://kompaspt1.com/contents//files/23080851623.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8ddd1c98a7b70013cb038ae439d374aa/55253057923.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+lord+of+the+rings+extended+online
    • 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_off0000d8fb.bin
8e9a704c830d26ffd2463e67e5a2af81c52854143ad0fb8e78bd569269678b70
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 10852 bytes
font_01_sfnt_off0000f1da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 16792 bytes
font_02_sfnt_off000109ec.bin
68ee0cd9a42fa2cb7171b226a339c1b0ea1ca28dc7ed129ea359dcfa34b599f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 16864 bytes