Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb18215b93a1fb07…

MALICIOUS

PDF

76.8 KB Created: 2021-07-23 14:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98c6d176815202bcf60696670e77b9c0 SHA-1: 469ad94e16dd3517c9ee0f9ed84fa7c0b79a4bda SHA-256: bb18215b93a1fb07cf8812f1e328e288f11fdb1825fe52ff802e933e318172a8
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 high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of multiple compromised domains and link farm characteristics strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.peretprod.ro/content-images/file/37797803035.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeaaa3ceb0---85367221898.pdf
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/jifufivimow.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb0f2f016---97061612360.pdf
    • http://seoulgreeter.com/userData/board/file/buvaparovamoko.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/de3b3a3f7afb09d21b5b6a99fbebe7a2/vidupab.pdf
    • http://kukubara.com/zdjecia/file/52578414839.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a1548bcd1---togovirugojovu.pdf
    • http://modern-pro.ru/files/file/dajuwigepejufap.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876d57a4ecc---24024226696.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/pofexuwifetiwixeja.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608af11171311---wabekuxatovupatobos.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/516e159f80a602bafe6727714dfa31da/43075334727.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856d6da90b9---mematenibexi.pdf
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/vexasesiz.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/16711335792.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/14952899497.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/tasojexanamibefari.pdf
    • http://teplospectr.ru/images/files/98129456138.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/46113179728.pdf
    • http://dzbnf.com/upload/file///62332322398.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3bccd74c3---58308379717.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/380550bf32e94e49e4deb90d8ebe61b6/76176373343.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sorboto+mongolo+radhe+binodini+rai+song+mp3+free+download
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e9.bin
af3e9269d9a31fc4b6cb6c0d58f1b03be5695fb577f14a617074673aef08a102
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E9 11416 bytes
font_01_sfnt_off0000e048.bin
1448cdb5ea7c7cfe95e4fb3750095632fae7b2e1b8b87b65c3371a234a9556b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 16968 bytes
font_02_sfnt_off00010cd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 16792 bytes