Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf3a973b21bbae6…

MALICIOUS

PDF

72.6 KB Created: 2021-09-13 20:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a42638c78742105a600f0bf83dde7b1d SHA-1: 223f194af65de94d6c44d176b53a33ea51aa0123 SHA-256: aaf3a973b21bbae613a27850487c0b4388e4094279d45cf52a25fb6a48de3205
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=gif+live+wallpaper+apk PDF link annotation
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa7f73b4f---bewisufixuz.pdfIn PDF document text
    • https://nasikampung.info/contents/files/29557846310.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/50477833095.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/sofikapowemilo.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/xeloxo.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/jadobexubug.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/nutosawifowosemisebemon.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/34665229031.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/72859194201.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/34612231042.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/vugopapadavuvifabin.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/rijod.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c28388cbeb6fc55db97888cda824dda3/70146747988.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16569402912.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/wawukuso.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/kafupomegajenif.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/rubodurelalivufanatiwajez.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/84411178762.pdfIn PDF document text
    • https://funke.be/data/file/78943364367.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///wedomekoton.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/37789429257.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/07ceff9f7bf11a0db3b9dc2fcf6455de/vuxebegupinanuvuz.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109031959125243.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/jiwojejolefiwet.pdfIn PDF document text
    • https://rjpexport.com/files/74025511067.pdfIn PDF document text
    • 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_off0000bbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 10144 bytes
SHA-256: d425eac3986f5ed5a50cf515da6b2007ee12280c6cc1826f93e8414d1a643f2d
font_02_sfnt_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 16244 bytes
SHA-256: c69ea439e140f28d9d42b09ff241d17ce3859f6619b53d3565ea6853b43ef144

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