Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf34fb445aa216f…

MALICIOUS

PDF

91.4 KB Created: 2021-07-20 17:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8aa732eb77bb8b4482e8a796dcc67422 SHA-1: 1ad3b344cf2e898b8057dbb4c424fc5b2ad489dc SHA-256: cdf34fb445aa216fed8872698cbbb29817d675818ab283ca261a23b3273b2f36
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the document as a link farm designed for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • 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.
  • 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.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/84f57e01f10623b1ef54a1e74e7c3c3b/34483284774.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f079fda6dae---48103393757.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/41f99ffa575312a9107513ae8dc559c0/20656732360.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acbddf847fa---bedofewivujekamajomej.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e47f057f021---xadirinomujavo.pdf
    • http://jjmcp.jp/userfiles/Image/file/fesolobew.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ecdc323bd---87961277353.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6c8e263e08546f2d943f9da90563ae35/rasefomujosididemiw.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160851f6998258---zokekaravali.pdf
    • http://faisaltowel.com/survey/userfiles/files/92127228132.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c7be60a44f5c471b65927136c8e1b8c6/20620622385.pdf
    • http://sibmetiz.ru/upload_picture/xemidol.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8652eee1---jufur.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210616_8EADD5D4681D23EA.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160742b7584c99---wilefowemagixefefupob.pdf
    • https://farstaslottsvik.nu/anvandarbilder/153/files/93836301366.pdf
    • http://www.thaiboat.net/image/upload/File/palako.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e910a58c---69635449879.pdf
    • http://asbufestival.com/uploads/FCK_files/file/32174199836.pdf
    • http://cablexconsulting.com/Upload/file/42452662009.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b93d1a323f8952b97129c4ad60a96001/85514390821.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4ddf6a66ab285699fa7336a987797b53/zulevofutesuwos.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/fopepidol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=windows+store+for+windows+8
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa52.bin
2acbc3b53d21cd6c7e435960238ed0d13be6f658fc61e32911ce60802a14398e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 2172 bytes
font_01_sfnt_off000103fa.bin
c960493cd11a7aaf2dfe475bed77800a71e7e2dd2d31f6a076ddb6087c8aa5fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 17008 bytes
font_02_sfnt_off00013041.bin
22e6e3eeb989299822c16dc69578602b9cde557c670434200c7e4601297b374f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13041 10428 bytes
font_03_sfnt_off0001480f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1480F 16792 bytes