Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58e6431f3635ce9…

MALICIOUS

PDF

71.1 KB Created: 2021-09-11 14:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a3e3cebad936beba9c105a764962194 SHA-1: 8e79190c796d25f67371c65bba37988b54993288 SHA-256: c58e6431f3635ce940a098063b380569eb166de1f7314f24259c7a128d9512a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a significant number of external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://princeverma.in/uploads/files/jibadarewoxor.pdf In PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/wevezejiwovozuwozugoz.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edbec9da5f---razasofupa.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/waxazufawinusop.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ofq4tq8b6qcf24upvjs0bsla75/mibizitibufenuvedax.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/90066327726.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/85096334666.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/61386156837.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161380d7872c58---55751186672.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/runulibapa.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/ferudinetubepa.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/95261613531.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109100625504668.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138114e447bc---37582947416.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/v7ei213ulu0fh7o2hhusee0aj6/19651304966.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/benixekugo.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/jugaw.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/77519471948.pdfIn PDF document text
    • http://topflexsports.com/uploads/vatuwesogoxepomazopeti.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210902_5C74E0E9BB9E9D92.pdfIn PDF document text
    • https://arendic.cl/files/40621292018.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/wasanexozuwosodexarab.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/7787106545.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/degonowerawipawepexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+download+porn+games+for+androidPDF 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_off0000b689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB689 15476 bytes
SHA-256: 6732753818758efce7f8806ce7ecf1d818961be8dc779e8dc0c286529b50bd75
font_01_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 10804 bytes
SHA-256: a8b9a2bb4a42fff9f662821cd67437d22ceacad324e7b51c988da896f6204509