Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cb9501fed62778…

MALICIOUS

PDF

87.6 KB Created: 2021-07-02 09:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: daade13a7c8120cda8dec607d57134de SHA-1: e4cea474e6742df8f847f3f39554fe33ea0ec265 SHA-256: 69cb9501fed62778208528982e2546f8bda4f1de738c416dadd9ccc5c40baef4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farm heuristics further supports the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097ea2137cfb---17598307502.pdf In PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf3dee266d57e01c002007ba08d2420f/89913422061.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/warelusax.pdfIn PDF document text
    • https://unosms.us/userfiles/file/sulamejarebaxujitofa.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/n60ol401ok40suuis6hq5io70f/buwuvozepenogonukuf.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be4e3f7e91a---vufixexizomo.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/64401426490.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/fulexuxubanibazu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88da87c6f---39127718525.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/84076183653.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-4/20210604094458533331.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c0657f9aede359040f87311b905e55dd/13768241577.pdfIn PDF document text
    • https://stvorki.ru/files/file/rudiwezi.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210516182913.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zumibez.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/88635378094.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/88694244525.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff46ac5316---valis.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/91671071759.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/7006573795.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a6b22983---45292644558.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/mosebofuxopepixuku.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/45c9edd215a450d764608221c75cfaa5/zawogas.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/37120663149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=taylor+swift+wildest+dreams+aboutPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 18512 bytes
SHA-256: ea02c3713bb8d17ed388b8a67d78d6acd804a0eb65ade54cc44a537362e733ed
font_01_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 10816 bytes
SHA-256: beeb7a06f944d16af8652f4b68dcd47ce8bc380fb23611c2aa025c64c74df731
font_02_sfnt_off000139b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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