Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc59ce753250958…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 13:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d22fc09724102f11f99411a4e3355d9 SHA-1: af316bfcab82bdba97e2566015ddc49b793af292 SHA-256: ebc59ce753250958e6916a3536ad50c0b946ea0e767b46d3102efb53f870a31e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and link farms. The heuristic 'SE_QR_LURE' indicates the document instructs users to scan a QR code, a common tactic for phishing or directing users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=qr+code+scanner+for+laptop PDF link annotation
    • http://due.pt/js/ckfinder/userfiles/files/77553960911.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393c4a93501---tajavijiwebugirikifuxo.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/79982956195.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/34169473481.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/dosofe.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab1944705---danatavabugabonuwef.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/munazusozikavirunufoza.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/nugeze.pdfIn PDF document text
    • https://matratva.in/userfiles/file/povidinuler.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/nefan.pdfIn PDF document text
    • https://theipbuzz.com/images/file/23716697450.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/mesarukukumumatut.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/vibemixazifa.pdfIn PDF document text
    • http://simoncaulkin.com/images/38268553345.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/lodowoxajosewosekojukiju.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/97930389977.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/69085576889.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/35650254598.pdfIn PDF document text
    • http://alvitraders.com/files/xalanuxitupexotiwopo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132808017b77---joriwediz.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/sobesidek.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/gofavezedit.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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 17112 bytes
SHA-256: ae2ef69b0a3a49a4f9f8d31d38eecd40499453566f26d293ad544ff32c32c793
font_01_sfnt_off00010cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 10580 bytes
SHA-256: ae3d7b0739b1c16d5dc52e1bc44709eb8b38ff7f3f1c750dac26805ce37826c0

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