Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbc10f8c6aa9c13…

MALICIOUS

PDF

75.6 KB Created: 2021-06-11 01:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 292acf8fa6e60c956d26f0f6716d7d5f SHA-1: 76a47eee3609cb0c2a7b6e6a5611931c54388989 SHA-256: bdbc10f8c6aa9c13b1f139f27a2616c0f1479dc544e015eee4db113f6bf3239c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to external websites, some of which appear to be hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button further supports the lure for a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=drp+12+offline+download
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c98769ce8f3c757fe1d08ed65e037af6/14189320606.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c8abedbef71db40e46cfb3760206577/28418240326.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/f0al6c520f0u44nqokas78l7bq/zivuj.pdf
    • http://adams-gold.ru/archive/image/file/fodadimakunadero.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1106f1f3405710d505d9e85319e30a4/gisulax.pdf
    • http://villa-carlshorst.de/sites/default/files/file/savokugefaxirar.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/90628c3d353d7648ad0a3e96792eb6f8/97518245541.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5a487e5d0766def3e6559d897bf806d4/wixovanulamisafi.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1770fa5f2d---66723640725.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cadfd9531---xedibifatoxerikusikobala.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/a19a006249d326391267f133bbc1c879/togelonoxufexepar.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec81c22d1.pdf
    • http://acecaalcoy.com/userfiles/file/98352387505.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8d624530a---tifaba.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd2657a51c---40970429227.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc3ac2a183e42651c49b9c2613ec957e/50103473889.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/arprusqo1ahm6cnhn9ouvsp0b3/2041441574.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082b61de2ca6---ruzuzumanulevifavumojaji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea34.bin
c4b0b1bf22ca0fc7a12fb086c467618591c4330a3dbeb6f36c2e60367b222f8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 5132 bytes
font_01_sfnt_off0000fbd8.bin
97ea84cb3e14f367ad6b288f627008c46a9d2e717b43f0ed645bd86115f07032
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 11056 bytes