Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba6b0b815f8d7d2…

MALICIOUS

PDF

87.9 KB Created: 2021-09-15 23:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2dc6feccdc6da97e6b7395105b7827c0 SHA-1: dae985cbf28364c48f8045ca307b590b36be3462 SHA-256: eba6b0b815f8d7d28fdfc54ffd20194064d02da1a70b468a062aa3ad6619274f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://calprin.com/ckfinder/userfiles/files/vipibajitabudo.pdf In PDF document text
    • https://poulinstrapscan.com/userfiles/file/xuvonidusemobeg.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/95746630056.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/votokizugoxunevesenelu.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/vagomudanerofabemeniva.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/zarewudiworowojeli.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/55718189319.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613060c31260e---bajezeg.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/3a360f002529edc65d8c3c016303e474/lagufudoxoli.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pazagifasifedizozusome.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613946a1cb5f8---57285849936.pdfIn PDF document text
    • http://chemsdano.com/upload/files/fetako.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/28083372108.pdfIn PDF document text
    • http://langyupharm.com/upload/files/bofunevinawejukefoketuku.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/70598601456.pdfIn PDF document text
    • http://land89.com/ckupload/files/piwebubufefivigevopi.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/rogoro.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/62169676549.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ketikovewiwavujareniranu.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/10373956110.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/66772562852.pdfIn PDF document text
    • https://maviet.vn/upload/files/megulid.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/14316390266.pdfIn PDF document text
    • https://geniodelweb.com/file/20899775574.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/ganupo.pdfIn PDF document text
    • http://lg-palette.com/upload/files/452290075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+a+zip+file+on+android+phonePDF 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_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 18592 bytes
SHA-256: e5b9de4fa1ce0c9d3df05d578637d378419b37d38068e586d9bdd0b1d591f166
font_02_sfnt_off0001391e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391E 10824 bytes
SHA-256: 333139eae12b13d94e94bf3d7130e0b9108da13b5a90f7577e9473807e5916b4