Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ce31ffdbad0da6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 19:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0082300948fc1708a8465c4a4572688 SHA-1: 9e95d7c5bed6a691758589da86137929ab1cbdb4 SHA-256: 03ce31ffdbad0da680633dd3abf4dd596a60dea31429cdc1f4eb640bcdd4030f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, but the heuristics clearly identify the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160913e9e29f9d---dojujidabe.pdf In PDF document text
    • http://oresteruggiero.com/userfiles/files/dadilimekifeka.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8af3042b7---wulaziwilo.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202108/file/67090575094.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc325b45cff---35040849008.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/rasokoweverig.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/wukovupimeluvow.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/498f34483fbb4b86bc492a02b0928fbb/51747160118.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/naxeguwalejufiso.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/87134426933.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e48b7044c9a531eec55c0bbc31f0d7ea/21465478075.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8601735e4---89100882445.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec40478e22---kulujinajeledubopa.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/44855451237.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8d9e54d1---fifilekorikasasaxupum.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kols76b65fn60eh0g84e5gsl54/pajavowanijololulosijo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/v0rv0jmr9f0ep6d6add4nb2q94/sivide.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1629714653633650800.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/zorepuvomujasapofesek.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-11/20210511081205154797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=samsung+bluetooth+headset+hm1100+manualPDF 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_off0000de74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 17304 bytes
SHA-256: 5e600f7706c769dd0bd2435152b8af147d1aed5184cf9b51dc4b1e707afea1eb
font_01_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 10992 bytes
SHA-256: 0fb4dfc2ea6a5300435ef2dce216bcec030f7ac77a983175a475d11d6f88424d
font_02_sfnt_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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