Malicious PDF — malware analysis report

Static analysis result for SHA-256 59518ee3e7dacf50…

MALICIOUS

PDF

83.0 KB Created: 2021-07-10 06:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7efbbe807da26a7d1ca16236a3467748 SHA-1: 1d66eff462a607c930cfa58f334256211638d17f SHA-256: 59518ee3e7dacf5041e91d2546349349acad6f5d1c2e37bbb7a675edb036463d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gld-lining.com/user_img/files/78196996114.pdf In PDF document text
    • http://ebd.su/UFD/7623/files/monomovazajobimenuselenij.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/61795fcf558f1893858b50ad5ef8b803/wexez.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/rodabakulobumeter.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/95913548815.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8e481475add035da54487ea8d3b32ba3/29621225040.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/basosu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b2e3ada86054094ffa7e1071532b71d3/kujerilonalesinapulibi.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/wiwikerojatiwikunelizajiv.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/52083439226.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/15969011825.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160773182e2671---sivevarofunosuzazuxi.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/36708653269.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/83785f29ac8ec3ccfe29454fae8afe78/pozapezowilasirixekulif.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/xuvitomuxitifepodidexori.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/af6b0b0b50929eb8e48365b027c25487/89981844018.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f62a371069---38708219351.pdfIn PDF document text
    • http://ekotronic.eu/files/file/zinojipotef.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/57016133247.pdfIn PDF document text
    • http://teplospectr.ru/images/files/medawaperobugiwobukowu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af9266a40cf---pedofusuko.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a5ed20d26ba6e43ecfb157b13bcd7083/94346300507.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/69965438141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=an+untidy+personPDF 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_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 10372 bytes
SHA-256: ba0bfbc7e13b649660cee7498168d46a8d2c3c13f7b4bfd27d0d1a9522b15ddb
font_01_sfnt_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 17812 bytes
SHA-256: 108b1522c27f0bbf1049a31e58cb40959d34855586a3c1d06bab4cd911d40985
font_02_sfnt_off000126f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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