Malicious PDF — malware analysis report

Static analysis result for SHA-256 68450e3dc8a58b2d…

MALICIOUS

PDF

90.1 KB Created: 2021-06-28 06:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9aa63d0fd07bf14448500289c2de41b5 SHA-1: 1410d30765147db581d6e805a67f9928743aa81d SHA-256: 68450e3dc8a58b2d47a95988eb79909507cffb9e4d6442c6376ce61be959f24d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of an embedded JavaScript stream further supports the malicious intent, likely to execute further malicious actions or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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 https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/eb1ec9dc87937f2938c89c0cd725374b/85240323258.pdf In PDF document text
    • http://kxnjl.com/userfiles/files/lewelimowujozulufesof.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ik134loaac4uidvocn7u66acdi/48937810812.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/17521951566.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7fa24c167---51199552536.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/1336349537.pdfIn PDF document text
    • http://revtechnik.cz/userfiles/file/fowofetujafefufudusas.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/timunasomoba.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a26ad2429---76805870247.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/favogu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/87454727679.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/97830245623.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16083585757e4c---8617810329.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a8dab3443---nulalujuvesopa.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/163202275.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806547d48a9---mafufamukufevakoputirabuz.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f3f005c2a61c78987a176017c173347f/82872926465.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160970f0ac180c---47768320446.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160715f4c08a94---kagijofevijifobimo.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/lojafikutijabesisaso.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/f779c1qvh9fovnc179crp4aj3j/kazigemosijija.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/90ebec67d450fcaf1760eedde9f2a676/49052365041.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9kijmsplhijnq1430aj6s3k5jg/kamevapusalilip.pdfIn PDF document text
    • https://advik.net/userfiles/file/runiganov.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jn6jl6iori8n308a8a5t8nos02/muwevudizewalidigobuzev.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089b56490104---fipuvatilirazepiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bodal+chemicals+share+pricePDF 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_off0000fabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 10628 bytes
SHA-256: bcb718f7653bca2ffa74d7bfcf73348d7870436ee0247d012a04fe03bfd32a41
font_01_sfnt_off000112f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F5 18120 bytes
SHA-256: b9ef89dae1f291ad6d39025c98b31f69f2c0c69cd4ad880fecf397073d332dfa
font_02_sfnt_off000142af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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