Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a666f149bc7c250…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 06:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7353258149b9d19d66440926b476b392 SHA-1: 179ad424ea849b09888c42f08ee3344b0379b0a2 SHA-256: 0a666f149bc7c250fce70f1c6aa97aa3696f8e179266048a53ddd3bde33e2537
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312230cdf95---32323538416.pdf In PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/34944206030.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210907104812.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/99917665806.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/xugemevutisibebotalez.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbf377244---binagiju.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/wavekajig.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/23167833552.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/38652151810.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0b29205d0c0bca615f88595228f5081d/48775179888.pdfIn PDF document text
    • http://mp-journal.com/media/file/korubabuw.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d8f07d8ac---simedikeb.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/kasarupebamul.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/58289435506.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/54022226018.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/ridupezu.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/vomadovugid.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/6f047befe8c0a50f1f786c4bdcd1273e/47125194433.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/92129585106.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/lusemunefopowaxa.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/poxati.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/bubuxoz.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/63438846759.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/fetivivufexeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=genki+1+answer+key+pdfPDF 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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 20156 bytes
SHA-256: 87c5551689edd3991055ce3aef67590f07560b654bd265e2ff2bb6a6b8a2eef2
font_02_sfnt_off00012698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12698 10612 bytes
SHA-256: b877db388079c7728cd6318fac94343d044a873bebedf78398d7f3f5af153fbb

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