Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b5d20fce0e1c0e…

MALICIOUS

PDF

103.2 KB Created: 2021-06-28 09:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c059a26ca7534b6fc25c84348ff69d66 SHA-1: a63988dec5967f459de9db8780f6f16f71db73b8 SHA-256: d3b5d20fce0e1c0ebedd1251b1792747fa577f05296b5a522d4b425d8d6eaf8b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The embedded JavaScript stream and ML classifier further support a malicious classification. The ClamAV detection confirms this sample is recognized as malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075df72754eb---rewukese.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9251b2ae0a---21900944538.pdf
    • https://info-jimukyoku.jp/lot/upload/files/93379656337.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087059a2835e---33536531465.pdf
    • https://evermoral.hk/upload/file/1624226716.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/4ba47309240591bac04604bb9a52ecab/18071661279.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0d0b23c3---60649185081.pdf
    • https://bio86.net/fichiers/sabofilofonevenam.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9aebaa7b---13964093441.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607258510dd4d---xitilaxiwoked.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/290510106b28772afe9078f278c0ffe6/torijinipusibenomexo.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/87ed0b97e1b9eabb3af626d5c3dd112d/67021840542.pdf
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/satabimeruwoxotodotemim.pdf
    • http://alrehabourhome.com/userfiles/files/fexuvux.pdf
    • https://alrukn.co/userfiles/files/98266147399.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/96474907914.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/pmvcgkv8gt1sldsmgi2irkf39u/21427450090.pdf
    • https://egca.fr/userfiles/file/dodabebonokirabov.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/h1rip24martl0552rnp4e3egv1/38194313469.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/1fb9mva87bm2vq3gbnv3as69n1/38213095070.pdf
    • http://boldogelet.hu/media/67725088130.pdf
    • http://bawaconstructions.com/editorData/file/41501611660.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/b6c6078570a4cb979f35c1a514f22245/28493732466.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d04c5c09---doponidipiruzab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dope+dyed+yarn
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001108e.bin
240b668d11eb7d17917a09fcd1005983d1dba4aeac5300949e2211b22dc08034		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 10096 bytes
font_01_sfnt_off0001271d.bin
b2719f39082b66364d311d408c7cda2108a9e86e46d20df49aa7b1fa3cc615e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1271D 18436 bytes
font_02_sfnt_off000157e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157E8 16792 bytes
font_03_sfnt_off00016ff5.bin
bcc803eb13d43216a786769c988e152b0748dea660d2ac03dd9e2a24eb716cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF5 1740 bytes
font_04_sfnt_off0001783a.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1783A 16060 bytes

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