Malicious PDF — malware analysis report

Static analysis result for SHA-256 d435e943ee223b45…

MALICIOUS

PDF

88.1 KB Created: 2021-08-13 04:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 576bbaffaef5d8c53a1c7ea6583f8a57 SHA-1: f39d08c3c6aa00c982d3ad1dc8b01c079ce14802 SHA-256: d435e943ee223b459b1e0c4c9bb77b0d2789546c32dfac7890a1a9fcdea021dd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the latter identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://shriayurvednagpur.org/public/ckfinder/userfiles/files/18380211248.pdf In PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1gb1r5n3hmtd7q06clmchhl9f5/65656810773.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf462cce0---riwafepaviveli.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/getideduru.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/zinunetebifemaviwo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f9f992775f035ae6f585c8293b2d7cd6/kogotimojapibolegap.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/rinadafaguj.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/wutovuxerodidozef.pdfIn PDF document text
    • https://pmms-online.com/assets/file/zuravexoteleko.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/lifafogezumo.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/dewopigunaxovefujulom.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/n8fcdgvhk1udoe57vd6hqse8h0/3290835652.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210713041420.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/89374497127.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160809f6103fc3---51116090225.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47dcb178c0---93892217169.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/poguwarolebi.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f6248626b1f64c869c741fd3f6186dbd/48326142891.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/68451763140.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8d5f0a4aa8c44242f4966d959526aad9/gejivuzogu.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///22403053212.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/a22ialq5jeov1a005qcr3p0b20/puziril.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bf00130a71ee07a6bdc74d65efb9bfd2/40385196323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=libro+para+colorear+ni%C3%B1os+3+a%C3%B1osPDF 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_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 18476 bytes
SHA-256: e63bf0d8759fa3f74dfb0fd0ac66183e6989d391f32180dd11c23847a78e3013
font_02_sfnt_off000136fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FE 10744 bytes
SHA-256: a588ca569249a7c6de8e2658cd139dda5392a1d79204183102a6044450e47797