Malicious PDF — malware analysis report

Static analysis result for SHA-256 de54b82be9d55cad…

MALICIOUS

PDF

102.1 KB Created: 2021-09-04 05:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f13d56a13551938822194e400c9d0ff SHA-1: ba92c37695fc8e205427150a261443f76554a23b SHA-256: de54b82be9d55cad5461882c024d9c42cfa6ff918d35b1e4830b0d8472ce28a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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 https://allytemp.ru/uplcv?utm_term=any+file+to+pdf+converter+free+download+for+windows+8 PDF link annotation
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/saliled.pdfIn PDF document text
    • http://coffee33.ru/archive/file/58840278347.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/46797920479.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854fcb2ee0b---49349740732.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/totukasaxamose.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/40662622267.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc9ac70b4a---vixavugitibomatujunif.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/50367914177.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/246fc3e96b6607713becfcbe9b213c60/41463655636.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/zopoxeb.pdfIn PDF document text
    • https://promtong.com/promtong/temp/file/36774135698.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7d958d8b4e7bb4ff9ba7d44d17f5a292/90252165212.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5666fe11b8e8c91db236f87e3644664a/44380731532.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/99017720682.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/kevokiribizuseg.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/rorulamizax.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/jalufonizozejewiniw.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/eb98v5kp22hu7k2b0e6i0oihi1/14259553167.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/36f50522919253524a0caa9b23467c3f/lujutelufokatiluxozixuxir.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/79425581440.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/fanodinemojinajutubopu.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/44271868120.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160aec4780e1ad---92186174645.pdfIn PDF document text
    • https://invest.pl/userfiles/file/95245079320.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/jutisovililuwozotojawuno.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B3 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_03_sfnt_off00013166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 24260 bytes
SHA-256: 2b58c87e63afafa826f8ec079abdf7f5aab7bb9510f8ba3532fb0cd83ea64286
font_04_sfnt_off00016ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED5 11068 bytes
SHA-256: acee89290cd8e443f56aeceb19acf8ae935615b7aec78553a0ee87249ae2f205

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